SudokuWiki.org
Strategies for Popular Number Puzzles
9x9 Solvers
6x6 Solvers
Weekly 'Unsolvable'
Puzzles to Play
Apps
Str8ts
Other
#687, February 28 - March 6, 2026:
|
|
WARNING: This is the Weekly 'Unsolvable' Sudoku, rated above 'Extreme'. This is currently unsolvable by my solver, except perhaps with trial and error strategies. Using the solver will not help you. (much). |
Archive
Each week a new 'unsolvable' will be published and the previous will be accessible here from this archive section. If you like very tough puzzles, these are for you.Share and Enjoy
Supporter Members have access to all these puzzles going back to number 1.
Discussion...
Post an idea here...Friday 6-Mar-2026
Friday 6-Mar-2026
... by: osiguy
KHB i didn't get stuck, here is the full solve! I have an advanced forcing chain which i'm sharing with Andrew that should help you solve these!This is a tough one!
Round 1
lastRemaining R2C8 = 5✓
Notes before: 1 3 5 6 → placed 5
5 can only go here in Box 3 — peers block all other spots
lastRemaining R5C5 = 6✓
Notes before: 5 6 7 → placed 6
6 can only go here in Box 5 — peers block all other spots
Round 2
pointingPair 2 eliminations
R5C4: 8 R6C4: 8
8 in Box 2 points along C4 — eliminates 2 | Removed: R5C4(8), R6C4(8)
Round 3
forcingChain 1 elimination
R9C7: 3
Forcing Chain from R9C7: eliminate contradicted | Removed: R9C7(3)
nakedSingle R9C7 = 6✓
Notes before: 6 → placed 6
Elimination left only {6} → place 6
Round 4
pointingPair 1 elimination
R3C1: 6
6 in Box 3 points along R3 — eliminates 1 | Removed: R3C1(6)
Round 5
forcingChain 1 elimination
R1C2: 9
Forcing Chain from R1C2: eliminate contradicted | Removed: R1C2(9)
Round 6
forcingChain 1 elimination
R3C5: 1
Forcing Chain from R3C5: eliminate contradicted | Removed: R3C5(1)
Round 7
forcingChain 1 elimination
R4C6: 7
Forcing Chain from R4C6: eliminate contradicted | Removed: R4C6(7)
Round 8
forcingChain 1 elimination
R5C1: 3
Forcing Chain from R5C1: eliminate contradicted | Removed: R5C1(3)
Round 9
pointingPair 2 eliminations
R4C7: 3 R4C8: 3
3 in Box 4 points along R4 — eliminates 2 | Removed: R4C7(3), R4C8(3)
claiming 3 eliminations
R7C9: 3 R8C7: 3 R8C9: 3
3 in C8 confined to Box 9 — eliminates 3 | Removed: R7C9(3), R8C7(3), R8C9(3)
Round 10
nakedTriple 4 eliminations
R5C3: 5,7 R5C7: 8 R5C9: 7
Naked Triple {5,7,8} in R5 | Removed: R5C3(5), R5C3(7), R5C7(8), R5C9(7)
nakedSingle R5C3 = 1✓
Notes before: 1 → placed 1
Elimination left only {1} → place 1
Round 11
claiming 1 elimination
R6C4: 7
7 in R5 confined to Box 5 — eliminates 1 | Removed: R6C4(7)
Round 12
forcingChain R5C4 = 7✓
Notes before: 5 7 → placed 7
Forcing Chain from R3C8: R5C4 must be 7
Round 13
forcingChain 1 elimination
R1C7: 4
Forcing Chain from R1C7: eliminate contradicted | Removed: R1C7(4)
Round 14
forcingChain 1 elimination
R2C1: 4
Forcing Chain from R2C1: eliminate contradicted | Removed: R2C1(4)
Round 15
forcingChain 1 elimination
R3C4: 4
Forcing Chain from R1C2: eliminate from R3C4 | Removed: R3C4(4)
Round 16
forcingChain 1 elimination
R3C5: 4
Forcing Chain from R3C5: eliminate contradicted | Removed: R3C5(4)
nakedSingle R3C5 = 9✓
Notes before: 9 → placed 9
Elimination left only {9} → place 9
Round 17
forcingChain 1 elimination
R1C7: 3
Forcing Chain from R1C7: eliminate contradicted | Removed: R1C7(3)
nakedSingle R1C7 = 9✓
Notes before: 9 → placed 9
Elimination left only {9} → place 9
Round 18
nakedTriple 3 eliminations
R2C2: 7 R2C3: 4,7
Naked Triple {4,7,8} in Box 1 | Removed: R2C2(7), R2C3(4), R2C3(7)
Round 19
pointingPair 1 elimination
R1C5: 7
7 in Box 1 points along R1 — eliminates 1 | Removed: R1C5(7)
Round 20
forcingChain 2 eliminations
R8C6: 3,4
Forcing Chain from R1C2: eliminate from R8C6 | Removed: R8C6(3), R8C6(4)
Round 21
forcingChain 2 eliminations
R8C2: 2,3
Forcing Chain from R1C2: eliminate from R8C2 | Removed: R8C2(2), R8C2(3)
Round 22
forcingChain 1 elimination
R1C5: 4
Forcing Chain from R1C5: eliminate contradicted | Removed: R1C5(4)
nakedSingle R1C5 = 5✓
Notes before: 5 → placed 5
Elimination left only {5} → place 5
Round 23
forcingChain R1C9 = 3✓
Notes before: 3 4 → placed 3
Forcing Chain from R1C9: must be 3
nakedSingle R5C9 = 2✓
Notes before: 2 → placed 2
Elimination left only {2} → place 2
Round 24
lastRemaining R5C7 = 3✓
Notes before: 3 → placed 3
3 can only go here in Box 6 — peers block all other spots
lastRemaining R8C7 = 2✓
Notes before: 1 2 8 → placed 2
2 can only go here in Box 9 — peers block all other spots
nakedSingle R8C9 = 1✓
Notes before: 1 → placed 1
Only candidate left: {1} → must be 1
hiddenSingle R7C5 = 1✓
Notes before: 1 7 → placed 1
1 has only one spot in R7 (cell had candidates {1,7})
hiddenSingle R7C2 = 2✓
Notes before: 2 3 9 → placed 2
2 has only one spot in R7 (cell had candidates {2,3,9})
hiddenSingle R8C8 = 8✓
Notes before: 3 8 → placed 8
8 has only one spot in R8 (cell had candidates {3,8})
hiddenSingle R2C3 = 2✓
Notes before: 2 6 9 → placed 2
2 has only one spot in C3 (cell had candidates {2,6,9})
Round 25
lastRemaining R9C8 = 3✓
Notes before: 3 7 → placed 3
3 can only go here in Box 9 — peers block all other spots
nakedSingle R7C9 = 7✓
Notes before: 7 → placed 7
Only candidate left: {7} → must be 7
nakedSingle R8C5 = 4✓
Notes before: 4 → placed 4
Only candidate left: {4} → must be 4
hiddenSingle R8C4 = 3✓
Notes before: 3 5 → placed 3
3 has only one spot in R8 (cell had candidates {3,5})
hiddenSingle R9C6 = 7✓
Notes before: 5 7 → placed 7
7 has only one spot in R9 (cell had candidates {5,7})
hiddenSingle R4C2 = 3✓
Notes before: 3 6 7 8 → placed 3
3 has only one spot in C2 (cell had candidates {3,6,7,8})
hiddenSingle R2C5 = 7✓
Notes before: 7 → placed 7
7 has only one spot in C5 (cell had candidates {7})
Round 26
lastRemaining R2C6 = 3✓
Notes before: 3 4 → placed 3
3 can only go here in Box 2 — peers block all other spots
lastRemaining R7C1 = 3✓
Notes before: 3 9 → placed 3
3 can only go here in Box 7 — peers block all other spots
lastRemaining R8C6 = 5✓
Notes before: 5 9 → placed 5
5 can only go here in Box 8 — peers block all other spots
nakedSingle R5C6 = 8✓
Notes before: 8 → placed 8
Only candidate left: {8} → must be 8
nakedSingle R7C6 = 9✓
Notes before: 9 → placed 9
Only candidate leftRound 1
lastRemaining R2C8 = 5✓
Notes before: 1 3 5 6 → placed 5
5 can only go here in Box 3 — peers block all other spots
lastRemaining R5C5 = 6✓
Notes before: 5 6 7 → placed 6
6 can only go here in Box 5 — peers block all other spots
Round 2
pointingPair 2 eliminations
R5C4: 8 R6C4: 8
8 in Box 2 points along C4 — eliminates 2 | Removed: R5C4(8), R6C4(8)
Round 3
forcingChain 1 elimination
R9C7: 3
Forcing Chain from R9C7: eliminate contradicted | Removed: R9C7(3)
nakedSingle R9C7 = 6✓
Notes before: 6 → placed 6
Elimination left only {6} → place 6
Round 4
pointingPair 1 elimination
R3C1: 6
6 in Box 3 points along R3 — eliminates 1 | Removed: R3C1(6)
Round 5
forcingChain 1 elimination
R1C2: 9
Forcing Chain from R1C2: eliminate contradicted | Removed: R1C2(9)
Round 6
forcingChain 1 elimination
R3C5: 1
Forcing Chain from R3C5: eliminate contradicted | Removed: R3C5(1)
Round 7
forcingChain 1 elimination
R4C6: 7
Forcing Chain from R4C6: eliminate contradicted | Removed: R4C6(7)
Round 8
forcingChain 1 elimination
R5C1: 3
Forcing Chain from R5C1: eliminate contradicted | Removed: R5C1(3)
Round 9
pointingPair 2 eliminations
R4C7: 3 R4C8: 3
3 in Box 4 points along R4 — eliminates 2 | Removed: R4C7(3), R4C8(3)
claiming 3 eliminations
R7C9: 3 R8C7: 3 R8C9: 3
3 in C8 confined to Box 9 — eliminates 3 | Removed: R7C9(3), R8C7(3), R8C9(3)
Round 10
nakedTriple 4 eliminations
R5C3: 5,7 R5C7: 8 R5C9: 7
Naked Triple {5,7,8} in R5 | Removed: R5C3(5), R5C3(7), R5C7(8), R5C9(7)
nakedSingle R5C3 = 1✓
Notes before: 1 → placed 1
Elimination left only {1} → place 1
Round 11
claiming 1 elimination
R6C4: 7
7 in R5 confined to Box 5 — eliminates 1 | Removed: R6C4(7)
Round 12
forcingChain R5C4 = 7✓
Notes before: 5 7 → placed 7
Forcing Chain from R3C8: R5C4 must be 7
Round 13
forcingChain 1 elimination
R1C7: 4
Forcing Chain from R1C7: eliminate contradicted | Removed: R1C7(4)
Round 14
forcingChain 1 elimination
R2C1: 4
Forcing Chain from R2C1: eliminate contradicted | Removed: R2C1(4)
Round 15
forcingChain 1 elimination
R3C4: 4
Forcing Chain from R1C2: eliminate from R3C4 | Removed: R3C4(4)
Round 16
forcingChain 1 elimination
R3C5: 4
Forcing Chain from R3C5: eliminate contradicted | Removed: R3C5(4)
nakedSingle R3C5 = 9✓
Notes before: 9 → placed 9
Elimination left only {9} → place 9
Round 17
forcingChain 1 elimination
R1C7: 3
Forcing Chain from R1C7: eliminate contradicted | Removed: R1C7(3)
nakedSingle R1C7 = 9✓
Notes before: 9 → placed 9
Elimination left only {9} → place 9
Round 18
nakedTriple 3 eliminations
R2C2: 7 R2C3: 4,7
Naked Triple {4,7,8} in Box 1 | Removed: R2C2(7), R2C3(4), R2C3(7)
Round 19
pointingPair 1 elimination
R1C5: 7
7 in Box 1 points along R1 — eliminates 1 | Removed: R1C5(7)
Round 20
forcingChain 2 eliminations
R8C6: 3,4
Forcing Chain from R1C2: eliminate from R8C6 | Removed: R8C6(3), R8C6(4)
Round 21
forcingChain 2 eliminations
R8C2: 2,3
Forcing Chain from R1C2: eliminate from R8C2 | Removed: R8C2(2), R8C2(3)
Round 22
forcingChain 1 elimination
R1C5: 4
Forcing Chain from R1C5: eliminate contradicted | Removed: R1C5(4)
nakedSingle R1C5 = 5✓
Notes before: 5 → placed 5
Elimination left only {5} → place 5
Round 23
forcingChain R1C9 = 3✓
Notes before: 3 4 → placed 3
Forcing Chain from R1C9: must be 3
nakedSingle R5C9 = 2✓
Notes before: 2 → placed 2
Elimination left only {2} → place 2
Round 24
lastRemaining R5C7 = 3✓
Notes before: 3 → placed 3
3 can only go here in Box 6 — peers block all other spots
lastRemaining R8C7 = 2✓
Notes before: 1 2 8 → placed 2
2 can only go here in Box 9 — peers block all other spots
nakedSingle R8C9 = 1✓
Notes before: 1 → placed 1
Only candidate left: {1} → must be 1
hiddenSingle R7C5 = 1✓
Notes before: 1 7 → placed 1
1 has only one spot in R7 (cell had candidates {1,7})
hiddenSingle R7C2 = 2✓
Notes before: 2 3 9 → placed 2
2 has only one spot in R7 (cell had candidates {2,3,9})
hiddenSingle R8C8 = 8✓
Notes before: 3 8 → placed 8
8 has only one spot in R8 (cell had candidates {3,8})
hiddenSingle R2C3 = 2✓
Notes before: 2 6 9 → placed 2
2 has only one spot in C3 (cell had candidates {2,6,9})
Round 25
lastRemaining R9C8 = 3✓
Notes before: 3 7 → placed 3
3 can only go here in Box 9 — peers block all other spots
nakedSingle R7C9 = 7✓
Notes before: 7 → placed 7
Only candidate left: {7} → must be 7
nakedSingle R8C5 = 4✓
Notes before: 4 → placed 4
Only candidate left: {4} → must be 4
hiddenSingle R8C4 = 3✓
Notes before: 3 5 → placed 3
3 has only one spot in R8 (cell had candidates {3,5})
hiddenSingle R9C6 = 7✓
Notes before: 5 7 → placed 7
7 has only one spot in R9 (cell had candidates {5,7})
hiddenSingle R4C2 = 3✓
Notes before: 3 6 7 8 → placed 3
3 has only one spot in C2 (cell had candidates {3,6,7,8})
hiddenSingle R2C5 = 7✓
Notes before: 7 → placed 7
7 has only one spot in C5 (cell had candidates {7})
Round 26
lastRemaining R2C6 = 3✓
Notes before: 3 4 → placed 3
3 can only go here in Box 2 — peers block all other spots
lastRemaining R7C1 = 3✓
Notes before: 3 9 → placed 3
3 can only go here in Box 7 — peers block all other spots
lastRemaining R8C6 = 5✓
Notes before: 5 9 → placed 5
5 can only go here in Box 8 — peers block all other spots
nakedSingle R5C6 = 8✓
Notes before: 8 → placed 8
Only candidate left: {8} → must be 8
nakedSingle R7C6 = 9✓
Notes before: 9 → placed 9
Only candidate left: {9} → must be 9
hiddenSingle R5C1 = 5✓
Notes before: 5 → placed 5
5 has only one spot in R5 (cell had candidates {5})
hiddenSingle R2C1 = 9✓
Notes before: 6 9 → placed 9
9 has only one spot in C1 (cell had candidates {6,9})
hiddenSingle R6C4 = 5✓
Notes before: 4 5 → placed 5
5 has only one spot in C4 (cell had candidates {4,5})
hiddenSingle R4C6 = 4✓
Notes before: 4 → placed 4
4 has only one spot in C6 (cell had candidates {4})
Round 27
lastRemaining R2C2 = 6✓
Notes before: 6 → placed 6
6 can only go here in Box 1 — peers block all other spots
lastRemaining R9C3 = 5✓
Notes before: 4 5 → placed 5
5 can only go here in Box 7 — peers block all other spots
nakedSingle R8C2 = 9✓
Notes before: 9 → placed 9
Only candidate left: {9} → must be 9: {9} → must be 9
hiddenSingle R5C1 = 5✓
Notes before: 5 → placed 5
5 has only one spot in R5 (cell had candidates {5})
hiddenSingle R2C1 = 9✓
Notes before: 6 9 → placed 9
9 has only one spot in C1 (cell had candidates {6,9})
hiddenSingle R6C4 = 5✓
Notes before: 4 5 → placed 5
5 has only one spot in C4 (cell had candidates {4,5})
hiddenSingle R4C6 = 4✓
Notes before: 4 → placed 4
4 has only one spot in C6 (cell had candidates {4})
Round 27
lastRemaining R2C2 = 6✓
Notes before: 6 → placed 6
6 can only go here in Box 1 — peers block all other spots
lastRemaining R9C3 = 5✓
Notes before: 4 5 → placed 5
5 can only go here in Box 7 — peers block all other spots
nakedSingle R8C2 = 9✓
Notes before: 9 → placed 9
Only candidate left: {9} → must be 9
Thursday 5-Mar-2026
... by: KHB
Hi osiguy,where does the output you shared below come from? Did you abandon the first 9 trials?
Wednesday 4-Mar-2026
... by: BGH
2-Step after Basics3 @ E7
-- Solves for 3’s in Blocks 1x3 & 2x3 51.9%
-- Solves for 6 in Block 3x3
5 @ J3 Convergence
Tuesday 3-Mar-2026
... by: osiguy
Super fun solve Andrew! 85 Moves!WSRF Player Solve Path
Puzzle: 100006020000000008053002700000920005040000090200031000008600540700000000010280009
Solution: 174856923962473158853192764637924815541768392289531476328619547796345281415287639
Date: 2026.03.03
Time: 00:56
Moves: 85
Max Level: L6
Shapes: Beam Scan:6 Force Vision:46 Ghost Signal:5 Zone Lock:25
Techniques: Pointing Pair:4 ALS-XY-Wing:4 Forcing Chain:19 Naked Triple:2 Naked Pair:2 Claiming:2 ALS-XZ:6 Template:16 Hidden Triple:1 Last Remaining:11 Hidden Single:1 Forcing Net:1 Full House:13
1. R2C8=5
2. R5C5=6
3. R9C7=6
4. ~R3C1-6 Pointing Pair/L3
Pointing Pair: 6 in Box 3 points along R3
5. ~R9C6-4 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=3, y=5, eliminates 4
6. ~R8C3-4 Pointing Pair/L3
Pointing Pair: 4 in Box 8 points along R8
7. ~R1C2-9 Forcing Chain/L4
Forcing Chain from R1C2: eliminate contradicted candidates
8. ~R3C5-1 Forcing Chain/L4
Forcing Chain from R3C5: eliminate contradicted candidates
9. ~R4C6-7 Forcing Chain/L4
Forcing Chain from R4C6: eliminate contradicted candidates
10. ~R5C1-3 Forcing Chain/L4
Forcing Chain from R5C1: eliminate contradicted candidates
11. ~R5C3-5 ~R5C3-7 ~R5C9-7 Naked Triple/L2
Naked Triple {5, 7, 8} in R5
12. R5C3=1 Forcing Chain/L4
Forcing Chain from R4C6: R5C3 must be 1
13. ~R4C7-3 ~R4C8-3 Naked Pair/L2
Naked Pair {2, 3} in Box 6
14. ~R6C4-7 Claiming/L3
Claiming: 7 in R5 is confined to Box 5
15. ~R7C9-3 ~R8C7-3 ~R8C9-3 Claiming/L3
Claiming: 3 in C8 is confined to Box 9
16. R5C4=7 Forcing Chain/L4
Forcing Chain from R3C8: R5C4 must be 7
17. ~R1C7-4 Forcing Chain/L4
Forcing Chain from R1C7: eliminate contradicted candidates
18. ~R2C1-4 Forcing Chain/L4
Forcing Chain from R2C1: eliminate contradicted candidates
19. ~R3C4-4 Forcing Chain/L4
Forcing Chain from R1C2: eliminate from R3C4
20. ~R3C5-4 Forcing Chain/L4
Forcing Chain from R3C5: eliminate contradicted candidates
21. R3C5=9 Forcing Chain/L4
Forcing Chain from R1C2: R3C5 must be 9
22. ~R2C3-4 ALS-XZ/L5
ALS-XZ: RCC=1, eliminates 4
23. ~R8C3-9 ALS-XZ/L5
ALS-XZ: RCC=6, eliminates 9
24. ~R8C6-4 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=9, y=5, eliminates 4
25. ~R8C5-5 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 5
26. R1C5=5 Forcing Chain/L4
Forcing Chain from R1C2: R1C5 must be 5
27. ~R2C2-7 ~R2C3-7 Pointing Pair/L3
Pointing Pair: 7 in Box 2 points along R2
28. ~R2C7-9 Naked Triple/L2
Naked Triple {2, 6, 9} in R2
29. R1C7=9 Forcing Chain/L4
Forcing Chain from R1C2: R1C7 must be 9
30. ~R4C8-6 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 6
31. ~R6C2-6 ~R6C3-6 Pointing Pair/L3
Pointing Pair: 6 in Box 6 points along R6
32. ~R8C2-2 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=5, y=9, eliminates 2
33. ~R6C3-5 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=8, y=2, eliminates 5
34. R5C1=5 Template/L6
Template: digit 5 always at R5C1 in all 2 valid patterns
35. R6C4=5 Template/L6
Template: digit 5 always at R6C4 in all 2 valid patterns
36. R4C6=4 Template/L6
Template: digit 4 always at R4C6 in all 5 valid patterns
37. R5C6=8 Template/L6
Template: digit 8 always at R5C6 in all 6 valid patterns
38. ~R8C3-2 ~R8C6-3 ~R8C2-3 Hidden Triple/L2
Hidden Triple {5, 6, 9} in R8
39. R7C2=2 Last Remaining/L1
Cross-hatching reveals 2 can only go in one cell in Box 7
40. R2C3=2 Template/L6
Template: digit 2 always at R2C3 in all 2 valid patterns
41. R4C2=3 Template/L6
Template: digit 3 always at R4C2 in all 5 valid patterns
42. R6C3=9 Template/L6
Template: digit 9 always at R6C3 in all 2 valid patterns
43. ~R7C6-7 Naked Pair/L2
Naked Pair {1, 7} in R7
44. ~R2C4-3 ALS-XZ/L5
ALS-XZ: RCC=2, eliminates 3
45. ~R4C8-7 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 7
46. R4C3=7 Hidden Single/L2
7 can only go in one cell in R4
47. R1C2=7 Forcing Chain/L4
Forcing Chain from R1C2: must be 7 — all other branches contradict
48. R3C1=8 Last Remaining/L1
Cross-hatching reveals 8 can only go in one cell in Box 1
49. R1C3=4 Template/L6
Template: digit 4 always at R1C3 in all 2 valid patterns
50. R1C4=8 Forcing Chain/L4
Forcing Chain from R1C4: must be 8 — all other branches contradict
51. R1C9=3 Template/L6
Template: digit 3 always at R1C9 in all 1 valid patterns
52. R2C6=3 Template/L6
Template: digit 3 always at R2C6 in all 1 valid patterns
53. R2C5=7 Forcing Net/L5
Forcing Net from R2C5: must be 7 — all other branches contradict
54. R2C4=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 2
55. R3C4=1 Full House/L1
Box 2 has 8 cells filled — the last cell is determined!
56. R8C4=3 Full House/L1
C4 has 8 cells filled — only one empty cell remains!
57. R2C7=1 Template/L6
Template: digit 1 always at R2C7 in all 2 valid patterns
58. R3C9=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 3
59. R3C8=6 Full House/L1
R3 has 8 cells filled — only one empty cell remains!
60. R4C1=6 Last Remaining/L1
Cross-hatching reveals 6 can only go in one cell in Box 4
61. R6C2=8 Full House/L1
Box 4 has 8 cells filled — the last cell is determined!
62. R2C2=6 Forcing Chain/L4
Forcing Chain from R2C2: must be 6 — all other branches contradict
63. R2C1=9 Full House/L1
R2 has 8 cells filled — only one empty cell remains!
64. R8C2=9 Full House/L1
C2 has 8 cells filled — only one empty cell remains!
65. R4C8=1 Forcing Chain/L4
Forcing Chain from R4C8: must be 1 — all other branches contradict
66. R4C7=8 Full House/L1
R4 has 8 cells filled — only one empty cell remains!
67. R5C7=3 Forcing Chain/L4
Forcing Chain from R5C7: must be 3 — all other branches contradict
68. R5C9=2 Template/L6
Template: digit 2 always at R5C9 in all 1 valid patterns
69. R6C7=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 6
70. R8C7=2 Template/L6
Template: digit 2 always at R8C7 in all 1 valid patterns
71. R6C9=6 ForcinWSRF Player Solve Path
Puzzle: 100006020000000008053002700000920005040000090200031000008600540700000000010280009
Solution: 174856923962473158853192764637924815541768392289531476328619547796345281415287639
Date: 2026.03.03
Time: 00:56
Moves: 85
Max Level: L6
Shapes: Beam Scan:6 Force Vision:46 Ghost Signal:5 Zone Lock:25
Techniques: Pointing Pair:4 ALS-XY-Wing:4 Forcing Chain:19 Naked Triple:2 Naked Pair:2 Claiming:2 ALS-XZ:6 Template:16 Hidden Triple:1 Last Remaining:11 Hidden Single:1 Forcing Net:1 Full House:13
1. R2C8=5
2. R5C5=6
3. R9C7=6
4. ~R3C1-6 Pointing Pair/L3
Pointing Pair: 6 in Box 3 points along R3
5. ~R9C6-4 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=3, y=5, eliminates 4
6. ~R8C3-4 Pointing Pair/L3
Pointing Pair: 4 in Box 8 points along R8
7. ~R1C2-9 Forcing Chain/L4
Forcing Chain from R1C2: eliminate contradicted candidates
8. ~R3C5-1 Forcing Chain/L4
Forcing Chain from R3C5: eliminate contradicted candidates
9. ~R4C6-7 Forcing Chain/L4
Forcing Chain from R4C6: eliminate contradicted candidates
10. ~R5C1-3 Forcing Chain/L4
Forcing Chain from R5C1: eliminate contradicted candidates
11. ~R5C3-5 ~R5C3-7 ~R5C9-7 Naked Triple/L2
Naked Triple {5, 7, 8} in R5
12. R5C3=1 Forcing Chain/L4
Forcing Chain from R4C6: R5C3 must be 1
13. ~R4C7-3 ~R4C8-3 Naked Pair/L2
Naked Pair {2, 3} in Box 6
14. ~R6C4-7 Claiming/L3
Claiming: 7 in R5 is confined to Box 5
15. ~R7C9-3 ~R8C7-3 ~R8C9-3 Claiming/L3
Claiming: 3 in C8 is confined to Box 9
16. R5C4=7 Forcing Chain/L4
Forcing Chain from R3C8: R5C4 must be 7
17. ~R1C7-4 Forcing Chain/L4
Forcing Chain from R1C7: eliminate contradicted candidates
18. ~R2C1-4 Forcing Chain/L4
Forcing Chain from R2C1: eliminate contradicted candidates
19. ~R3C4-4 Forcing Chain/L4
Forcing Chain from R1C2: eliminate from R3C4
20. ~R3C5-4 Forcing Chain/L4
Forcing Chain from R3C5: eliminate contradicted candidates
21. R3C5=9 Forcing Chain/L4
Forcing Chain from R1C2: R3C5 must be 9
22. ~R2C3-4 ALS-XZ/L5
ALS-XZ: RCC=1, eliminates 4
23. ~R8C3-9 ALS-XZ/L5
ALS-XZ: RCC=6, eliminates 9
24. ~R8C6-4 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=9, y=5, eliminates 4
25. ~R8C5-5 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 5
26. R1C5=5 Forcing Chain/L4
Forcing Chain from R1C2: R1C5 must be 5
27. ~R2C2-7 ~R2C3-7 Pointing Pair/L3
Pointing Pair: 7 in Box 2 points along R2
28. ~R2C7-9 Naked Triple/L2
Naked Triple {2, 6, 9} in R2
29. R1C7=9 Forcing Chain/L4
Forcing Chain from R1C2: R1C7 must be 9
30. ~R4C8-6 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 6
31. ~R6C2-6 ~R6C3-6 Pointing Pair/L3
Pointing Pair: 6 in Box 6 points along R6
32. ~R8C2-2 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=5, y=9, eliminates 2
33. ~R6C3-5 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=8, y=2, eliminates 5
34. R5C1=5 Template/L6
Template: digit 5 always at R5C1 in all 2 valid patterns
35. R6C4=5 Template/L6
Template: digit 5 always at R6C4 in all 2 valid patterns
36. R4C6=4 Template/L6
Template: digit 4 always at R4C6 in all 5 valid patterns
37. R5C6=8 Template/L6
Template: digit 8 always at R5C6 in all 6 valid patterns
38. ~R8C3-2 ~R8C6-3 ~R8C2-3 Hidden Triple/L2
Hidden Triple {5, 6, 9} in R8
39. R7C2=2 Last Remaining/L1
Cross-hatching reveals 2 can only go in one cell in Box 7
40. R2C3=2 Template/L6
Template: digit 2 always at R2C3 in all 2 valid patterns
41. R4C2=3 Template/L6
Template: digit 3 always at R4C2 in all 5 valid patterns
42. R6C3=9 Template/L6
Template: digit 9 always at R6C3 in all 2 valid patterns
43. ~R7C6-7 Naked Pair/L2
Naked Pair {1, 7} in R7
44. ~R2C4-3 ALS-XZ/L5
ALS-XZ: RCC=2, eliminates 3
45. ~R4C8-7 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 7
46. R4C3=7 Hidden Single/L2
7 can only go in one cell in R4
47. R1C2=7 Forcing Chain/L4
Forcing Chain from R1C2: must be 7 — all other branches contradict
48. R3C1=8 Last Remaining/L1
Cross-hatching rWSRF Player Solve Path
Puzzle: 100006020000000008053002700000920005040000090200031000008600540700000000010280009
Solution: 174856923962473158853192764637924815541768392289531476328619547796345281415287639
Date: 2026.03.03
Time: 00:56
Moves: 85
Max Level: L6
Shapes: Beam Scan:6 Force Vision:46 Ghost Signal:5 Zone Lock:25
Techniques: Pointing Pair:4 ALS-XY-Wing:4 Forcing Chain:19 Naked Triple:2 Naked Pair:2 Claiming:2 ALS-XZ:6 Template:16 Hidden Triple:1 Last Remaining:11 Hidden Single:1 Forcing Net:1 Full House:13
1. R2C8=5
2. R5C5=6
3. R9C7=6
4. ~R3C1-6 Pointing Pair/L3
Pointing Pair: 6 in Box 3 points along R3
5. ~R9C6-4 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=3, y=5, eliminates 4
6. ~R8C3-4 Pointing Pair/L3
Pointing Pair: 4 in Box 8 points along R8
7. ~R1C2-9 Forcing Chain/L4
Forcing Chain from R1C2: eliminate contradicted candidates
8. ~R3C5-1 Forcing Chain/L4
Forcing Chain from R3C5: eliminate contradicted candidates
9. ~R4C6-7 Forcing Chain/L4
Forcing Chain from R4C6: eliminate contradicted candidates
10. ~R5C1-3 Forcing Chain/L4
Forcing Chain from R5C1: eliminate contradicted candidates
11. ~R5C3-5 ~R5C3-7 ~R5C9-7 Naked Triple/L2
Naked Triple {5, 7, 8} in R5
12. R5C3=1 Forcing Chain/L4
Forcing Chain from R4C6: R5C3 must be 1
13. ~R4C7-3 ~R4C8-3 Naked Pair/L2
Naked Pair {2, 3} in Box 6
14. ~R6C4-7 Claiming/L3
Claiming: 7 in R5 is confined to Box 5
15. ~R7C9-3 ~R8C7-3 ~R8C9-3 Claiming/L3
Claiming: 3 in C8 is confined to Box 9
16. R5C4=7 Forcing Chain/L4
Forcing Chain from R3C8: R5C4 must be 7
17. ~R1C7-4 Forcing Chain/L4
Forcing Chain from R1C7: eliminate contradicted candidates
18. ~R2C1-4 Forcing Chain/L4
Forcing Chain from R2C1: eliminate contradicted candidates
19. ~R3C4-4 Forcing Chain/L4
Forcing Chain from R1C2: eliminate from R3C4
20. ~R3C5-4 Forcing Chain/L4
Forcing Chain from R3C5: eliminate contradicted candidates
21. R3C5=9 Forcing Chain/L4
Forcing Chain from R1C2: R3C5 must be 9
22. ~R2C3-4 ALS-XZ/L5
ALS-XZ: RCC=1, eliminates 4
23. ~R8C3-9 ALS-XZ/L5
ALS-XZ: RCC=6, eliminates 9
24. ~R8C6-4 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=9, y=5, eliminates 4
25. ~R8C5-5 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 5
26. R1C5=5 Forcing Chain/L4
Forcing Chain from R1C2: R1C5 must be 5
27. ~R2C2-7 ~R2C3-7 Pointing Pair/L3
Pointing Pair: 7 in Box 2 points along R2
28. ~R2C7-9 Naked Triple/L2
Naked Triple {2, 6, 9} in R2
29. R1C7=9 Forcing Chain/L4
Forcing Chain from R1C2: R1C7 must be 9
30. ~R4C8-6 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 6
31. ~R6C2-6 ~R6C3-6 Pointing Pair/L3
Pointing Pair: 6 in Box 6 points along R6
32. ~R8C2-2 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=5, y=9, eliminates 2
33. ~R6C3-5 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=8, y=2, eliminates 5
34. R5C1=5 Template/L6
Template: digit 5 always at R5C1 in all 2 valid patterns
35. R6C4=5 Template/L6
Template: digit 5 always at R6C4 in all 2 valid patterns
36. R4C6=4 Template/L6
Template: digit 4 always at R4C6 in all 5 valid patterns
37. R5C6=8 Template/L6
Template: digit 8 always at R5C6 in all 6 valid patterns
38. ~R8C3-2 ~R8C6-3 ~R8C2-3 Hidden Triple/L2
Hidden Triple {5, 6, 9} in R8
39. R7C2=2 Last Remaining/L1
Cross-hatching reveals 2 can only go in one cell in Box 7
40. R2C3=2 Template/L6
Template: digit 2 always at R2C3 in all 2 valid patterns
41. R4C2=3 Template/L6
Template: digit 3 always at R4C2 in all 5 valid patterns
42. R6C3=9 Template/L6
Template: digit 9 always at R6C3 in all 2 valid patterns
43. ~R7C6-7 Naked Pair/L2
Naked Pair {1, 7} in R7
44. ~R2C4-3 ALS-XZ/L5
ALS-XZ: RCC=2, eliminates 3
45. ~R4C8-7 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 7
46. R4C3=7 Hidden Single/L2
7 can only go in one cell in R4
47. R1C2=7 Forcing Chain/L4
Forcing Chain from R1C2: must be 7 — all other branches contradict
48. R3C1=8 Last Remaining/L1
Cross-hatching reveals 8 can only go in one cell in Box 1
49. R1C3=4 Template/L6
Template: digit 4 always at R1C3 in all 2 valid patterns
50. R1C4=8 Forcing Chain/L4
Forcing Chain from R1C4: must be 8 — all other branches contradict
51. R1C9=3 Template/L6
Template: digit 3 always at R1C9 in all 1 valid patterns
52. R2C6=3 Template/L6
Template: digit 3 always at R2C6 in all 1 valid patterns
53. R2C5=7 Forcing Net/L5
Forcing Net from R2C5: must be 7 — all other branches contradict
54. R2C4=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 2
55. R3C4=1 Full House/L1
Box 2 has 8 cells filled — the last cell is determined!
56. R8C4=3 Full House/L1
C4 has 8 cells filled — only one empty cell remains!
57. R2C7=1 Template/L6
Template: digit 1 always at R2C7 in all 2 valid patterns
58. R3C9=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 3
59. R3C8=6 Full House/L1
R3 has 8 cells filled — only one empty cell remains!
60. R4C1=6 Last Remaining/L1
Cross-hatching reveals 6 can only go in one cell in Box 4
61. R6C2=8 Full House/L1
Box 4 has 8 cells filled — the last cell is determined!
62. R2C2=6 Forcing Chain/L4
Forcing Chain from R2C2: must be 6 — all other branches contradict
63. R2C1=9 Full House/L1
R2 has 8 cells filled — only one empty cell remains!
64. R8C2=9 Full House/L1
C2 has 8 cells filled — only one empty cell remains!
65. R4C8=1 Forcing Chain/L4
Forcing Chain from R4C8: must be 1 — all other branches contradict
66. R4C7=8 Full House/L1
R4 has 8 cells filled — only one empty cell remains!
67. R5C7=3 Forcing Chain/L4
Forcing Chain from R5C7: must be 3 — all other branches contradict
68. R5C9=2 Template/L6
Template: digit 2 always at R5C9 in all 1 valid patterns
69. R6C7=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 6
70. R8C7=2 Template/L6
Template: digit 2 always at R8C7 in all 1 valid patterns
71. R6C9=6 Forcing Chain/L4
Forcing Chain from R6C9: must be 6 — all other branches contradict
72. R6C8=7 Full House/L1
R6 has 8 cells filled — only one empty cell remains!
73. R9C1=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 7
74. R7C1=3 Template/L6
Template: digit 3 always at R7C1 in all 1 valid patterns
75. R8C3=6 Last Remaining/L1
Cross-hatching reveals 6 can only go in one cell in Box 7
76. R9C3=5 Full House/L1
C3 has 8 cells filled — only one empty cell remains!
77. R8C5=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 8
78. R7C5=1 Template/L6
Template: digit 1 always at R7C5 in all 1 valid patterns
79. R8C6=5 Last Remaining/L1
Cross-hatching reveals 5 can only go in one cell in Box 8
80. R9C6=7 Last Remaining/L1
Cross-hatching reveals 7 can only go in one cell in Box 8
81. R9C8=3 Full House/L1
R9 has 8 cells filled — only one empty cell remains!
82. R7C6=9 Full House/L1
C6 has 8 cells filled — only one empty cell remains!
83. R7C9=7 Full HoWSRF Player Solve Path
Puzzle: 100006020000000008053002700000920005040000090200031000008600540700000000010280009
Solution: 174856923962473158853192764637924815541768392289531476328619547796345281415287639
Date: 2026.03.03
Time: 00:56
Moves: 85
Max Level: L6
Shapes: Beam Scan:6 Force Vision:46 Ghost Signal:5 Zone Lock:25
Techniques: Pointing Pair:4 ALS-XY-Wing:4 Forcing Chain:19 Naked Triple:2 Naked Pair:2 Claiming:2 ALS-XZ:6 Template:16 Hidden Triple:1 Last Remaining:11 Hidden Single:1 Forcing Net:1 Full House:13
1. R2C8=5
2. R5C5=6
3. R9C7=6
4. ~R3C1-6 Pointing Pair/L3
Pointing Pair: 6 in Box 3 points along R3
5. ~R9C6-4 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=3, y=5, eliminates 4
6. ~R8C3-4 Pointing Pair/L3
Pointing Pair: 4 in Box 8 points along R8
7. ~R1C2-9 Forcing Chain/L4
Forcing Chain from R1C2: eliminate contradicted candidates
8. ~R3C5-1 Forcing Chain/L4
Forcing Chain from R3C5: eliminate contradicted candidates
9. ~R4C6-7 Forcing Chain/L4
Forcing Chain from R4C6: eliminate contradicted candidates
10. ~R5C1-3 Forcing Chain/L4
Forcing Chain from R5C1: eliminate contradicted candidates
11. ~R5C3-5 ~R5C3-7 ~R5C9-7 Naked Triple/L2
Naked Triple {5, 7, 8} in R5
12. R5C3=1 Forcing Chain/L4
Forcing Chain from R4C6: R5C3 must be 1
13. ~R4C7-3 ~R4C8-3 Naked Pair/L2
Naked Pair {2, 3} in Box 6
14. ~R6C4-7 Claiming/L3
Claiming: 7 in R5 is confined to Box 5
15. ~R7C9-3 ~R8C7-3 ~R8C9-3 Claiming/L3
Claiming: 3 in C8 is confined to Box 9
16. R5C4=7 Forcing Chain/L4
Forcing Chain from R3C8: R5C4 must be 7
17. ~R1C7-4 Forcing Chain/L4
Forcing Chain from R1C7: eliminate contradicted candidates
18. ~R2C1-4 Forcing Chain/L4
Forcing Chain from R2C1: eliminate contradicted candidates
19. ~R3C4-4 Forcing Chain/L4
Forcing Chain from R1C2: eliminate from R3C4
20. ~R3C5-4 Forcing Chain/L4
Forcing Chain from R3C5: eliminate contradicted candidates
21. R3C5=9 Forcing Chain/L4
Forcing Chain from R1C2: R3C5 must be 9
22. ~R2C3-4 ALS-XZ/L5
ALS-XZ: RCC=1, eliminates 4
23. ~R8C3-9 ALS-XZ/L5
ALS-XZ: RCC=6, eliminates 9
24. ~R8C6-4 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=9, y=5, eliminates 4
25. ~R8C5-5 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 5
26. R1C5=5 Forcing Chain/L4
Forcing Chain from R1C2: R1C5 must be 5
27. ~R2C2-7 ~R2C3-7 Pointing Pair/L3
Pointing Pair: 7 in Box 2 points along R2
28. ~R2C7-9 Naked Triple/L2
Naked Triple {2, 6, 9} in R2
29. R1C7=9 Forcing Chain/L4
Forcing Chain from R1C2: R1C7 must be 9
30. ~R4C8-6 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 6
31. ~R6C2-6 ~R6C3-6 Pointing Pair/L3
Pointing Pair: 6 in Box 6 points along R6
32. ~R8C2-2 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=5, y=9, eliminates 2
33. ~R6C3-5 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=8, y=2, eliminates 5
34. R5C1=5 Template/L6
Template: digit 5 always at R5C1 in all 2 valid patterns
35. R6C4=5 Template/L6
Template: digit 5 always at R6C4 in all 2 valid patterns
36. R4C6=4 Template/L6
Template: digit 4 always at R4C6 in all 5 valid patterns
37. R5C6=8 Template/L6
Template: digit 8 always at R5C6 in all 6 valid patterns
38. ~R8C3-2 ~R8C6-3 ~R8C2-3 Hidden Triple/L2
Hidden Triple {5, 6, 9} in R8
39. R7C2=2 Last Remaining/L1
Cross-hatching reveals 2 can only go in one cell in Box 7
40. R2C3=2 Template/L6
Template: digit 2 always at R2C3 in all 2 valid patterns
41. R4C2=3 Template/L6
Template: digit 3 always at R4C2 in all 5 valid patterns
42. R6C3=9 Template/L6
Template: digit 9 always at R6C3 in all 2 valid patterns
43. ~R7C6-7 Naked Pair/L2
Naked Pair {1, 7} in R7
44. ~R2C4-3 ALS-XZ/L5
ALS-XZ: RCC=2, eliminates 3
45. ~R4C8-7 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 7
46. R4C3=7 Hidden Single/L2
7 can only go in one cell in R4
47. R1C2=7 Forcing Chain/L4
Forcing Chain from R1C2: must be 7 — all other branches contradict
48. R3C1=8 Last Remaining/L1
Cross-hatching reveals 8 can only go in one cell in Box 1
49. R1C3=4 Template/L6
Template: digit 4 always at R1C3 in all 2 valid patterns
50. R1C4=8 Forcing Chain/L4
Forcing Chain from R1C4: must be 8 — all other branches contradict
51. R1C9=3 Template/L6
Template: digit 3 always at R1C9 in all 1 valid patterns
52. R2C6=3 Template/L6
Template: digit 3 always at R2C6 in all 1 valid patterns
53. R2C5=7 Forcing Net/L5
Forcing Net from R2C5: must be 7 — all other branches contradict
54. R2C4=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 2
55. R3C4=1 Full House/L1
Box 2 has 8 cells filled — the last cell is determined!
56. R8C4=3 Full House/L1
C4 has 8 cells filled — only one empty cell remains!
57. R2C7=1 Template/L6
Template: digit 1 always at R2C7 in all 2 valid patterns
58. R3C9=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 3
59. R3C8=6 Full House/L1
R3 has 8 cells filled — only one empty cell remains!
60. R4C1=6 Last Remaining/L1
Cross-hatching reveals 6 can only go in one cell in Box 4
61. R6C2=8 Full House/L1
Box 4 has 8 cells filled — the last cell is determined!
62. R2C2=6 Forcing Chain/L4
Forcing Chain from R2C2: must be 6 — all other branches contradict
63. R2C1=9 Full House/L1
R2 has 8 cells filled — only one empty cell remains!
64. R8C2=9 Full House/L1
C2 has 8 cells filled — only one empty cell remains!
65. R4C8=1 Forcing Chain/L4
Forcing Chain from R4C8: must be 1 — all other branches contradict
66. R4C7=8 Full House/L1
R4 has 8 cells filled — only one empty cell remains!
67. R5C7=3 Forcing Chain/L4
Forcing Chain from R5C7: must be 3 — all other branches contradict
68. R5C9=2 Template/L6
Template: digit 2 always at R5C9 in all 1 valid patterns
69. R6C7=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 6
70. R8C7=2 Template/L6
Template: digit 2 always at R8C7 in all 1 valid patterns
71. R6C9=6 Forcing Chain/L4
Forcing Chain from R6C9: must be 6 — all other branches contradict
72. R6C8=7 Full House/L1
R6 has 8 cells filled — only one empty cell remains!
73. R9C1=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 7
74. R7C1=3 Template/L6
Template: digit 3 always at R7C1 in all 1 valid patterns
75. R8C3=6 Last Remaining/L1
Cross-hatching reveals 6 can only go in one cell in Box 7
76. R9C3=5 Full House/L1
C3 has 8 cells filled — only one empty cell remains!
77. R8C5=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 8
78. R7C5=1 Template/L6
Template: digit 1 always at R7C5 in all 1 valid patterns
79. R8C6=5 Last Remaining/L1
Cross-hatching reveals 5 can only go in one cell in Box 8
80. R9C6=7 Last Remaining/L1
Cross-hatching reveals 7 can only go in one cell in Box 8
81. R9C8=3 Full House/L1
R9 has 8 cells filled — only one empty cell remains!
82. R7C6=9 Full House/L1
C6 has 8 cells filled — only one empty cell remains!
83. R7C9=7 Full HoWSRF Player Solve Path
Puzzle: 100006020000000008053002700000920005040000090200031000008600540700000000010280009
Solution: 174856923962473158853192764637924815541768392289531476328619547796345281415287639
Date: 2026.03.03
Time: 00:56
Moves: 85
Max Level: L6
Shapes: Beam Scan:6 Force Vision:46 Ghost Signal:5 Zone Lock:25
Techniques: Pointing Pair:4 ALS-XY-Wing:4 Forcing Chain:19 Naked Triple:2 Naked Pair:2 Claiming:2 ALS-XZ:6 Template:16 Hidden Triple:1 Last Remaining:11 Hidden Single:1 Forcing Net:1 Full House:13
1. R2C8=5
2. R5C5=6
3. R9C7=6
4. ~R3C1-6 Pointing Pair/L3
Pointing Pair: 6 in Box 3 points along R3
5. ~R9C6-4 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=3, y=5, eliminates 4
6. ~R8C3-4 Pointing Pair/L3
Pointing Pair: 4 in Box 8 points along R8
7. ~R1C2-9 Forcing Chain/L4
Forcing Chain from R1C2: eliminate contradicted candidates
8. ~R3C5-1 Forcing Chain/L4
Forcing Chain from R3C5: eliminate contradicted candidates
9. ~R4C6-7 Forcing Chain/L4
Forcing Chain from R4C6: eliminate contradicted candidates
10. ~R5C1-3 Forcing Chain/L4
Forcing Chain from R5C1: eliminate contradicted candidates
11. ~R5C3-5 ~R5C3-7 ~R5C9-7 Naked Triple/L2
Naked Triple {5, 7, 8} in R5
12. R5C3=1 Forcing Chain/L4
Forcing Chain from R4C6: R5C3 must be 1
13. ~R4C7-3 ~R4C8-3 Naked Pair/L2
Naked Pair {2, 3} in Box 6
14. ~R6C4-7 Claiming/L3
Claiming: 7 in R5 is confined to Box 5
15. ~R7C9-3 ~R8C7-3 ~R8C9-3 Claiming/L3
Claiming: 3 in C8 is confined to Box 9
16. R5C4=7 Forcing Chain/L4
Forcing Chain from R3C8: R5C4 must be 7
17. ~R1C7-4 Forcing Chain/L4
Forcing Chain from R1C7: eliminate contradicted candidates
18. ~R2C1-4 Forcing Chain/L4
Forcing Chain from R2C1: eliminate contradicted candidates
19. ~R3C4-4 Forcing Chain/L4
Forcing Chain from R1C2: eliminate from R3C4
20. ~R3C5-4 Forcing Chain/L4
Forcing Chain from R3C5: eliminate contradicted candidates
21. R3C5=9 Forcing Chain/L4
Forcing Chain from R1C2: R3C5 must be 9
22. ~R2C3-4 ALS-XZ/L5
ALS-XZ: RCC=1, eliminates 4
23. ~R8C3-9 ALS-XZ/L5
ALS-XZ: RCC=6, eliminates 9
24. ~R8C6-4 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=9, y=5, eliminates 4
25. ~R8C5-5 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 5
26. R1C5=5 Forcing Chain/L4
Forcing Chain from R1C2: R1C5 must be 5
27. ~R2C2-7 ~R2C3-7 Pointing Pair/L3
Pointing Pair: 7 in Box 2 points along R2
28. ~R2C7-9 Naked Triple/L2
Naked Triple {2, 6, 9} in R2
29. R1C7=9 Forcing Chain/L4
Forcing Chain from R1C2: R1C7 must be 9
30. ~R4C8-6 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 6
31. ~R6C2-6 ~R6C3-6 Pointing Pair/L3
Pointing Pair: 6 in Box 6 points along R6
32. ~R8C2-2 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=5, y=9, eliminates 2
33. ~R6C3-5 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=8, y=2, eliminates 5
34. R5C1=5 Template/L6
Template: digit 5 always at R5C1 in all 2 valid patterns
35. R6C4=5 Template/L6
Template: digit 5 always at R6C4 in all 2 valid patterns
36. R4C6=4 Template/L6
Template: digit 4 always at R4C6 in all 5 valid patterns
37. R5C6=8 Template/L6
Template: digit 8 always at R5C6 in all 6 valid patterns
38. ~R8C3-2 ~R8C6-3 ~R8C2-3 Hidden Triple/L2
Hidden Triple {5, 6, 9} in R8
39. R7C2=2 Last Remaining/L1
Cross-hatching reveals 2 can only go in one cell in Box 7
40. R2C3=2 Template/L6
Template: digit 2 always at R2C3 in all 2 valid patterns
41. R4C2=3 Template/L6
Template: digit 3 always at R4C2 in all 5 valid patterns
42. R6C3=9 Template/L6
Template: digit 9 always at R6C3 in all 2 valid patterns
43. ~R7C6-7 Naked Pair/L2
Naked Pair {1, 7} in R7
44. ~R2C4-3 ALS-XZ/L5
ALS-XZ: RCC=2, eliminates 3
45. ~R4C8-7 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 7
46. R4C3=7 Hidden Single/L2
7 can only go in one cell in R4
47. R1C2=7 Forcing Chain/L4
Forcing Chain from R1C2: must be 7 — all other branches contradict
48. R3C1=8 Last Remaining/L1
Cross-hatching reveals 8 can only go in one cell in Box 1
49. R1C3=4 Template/L6
Template: digit 4 always at R1C3 in all 2 valid patterns
50. R1C4=8 Forcing Chain/L4
Forcing Chain from R1C4: must be 8 — all other branches contradict
51. R1C9=3 Template/L6
Template: digit 3 always at R1C9 in all 1 valid patterns
52. R2C6=3 Template/L6
Template: digit 3 always at R2C6 in all 1 valid patterns
53. R2C5=7 Forcing Net/L5
Forcing Net from R2C5: must be 7 — all other branches contradict
54. R2C4=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 2
55. R3C4=1 Full House/L1
Box 2 has 8 cells filled — the last cell is determined!
56. R8C4=3 Full House/L1
C4 has 8 cells filled — only one empty cell remains!
57. R2C7=1 Template/L6
Template: digit 1 always at R2C7 in all 2 valid patterns
58. R3C9=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 3
59. R3C8=6 Full House/L1
R3 has 8 cells filled — only one empty cell remains!
60. R4C1=6 Last Remaining/L1
Cross-hatching reveals 6 can only go in one cell in Box 4
61. R6C2=8 Full House/L1
Box 4 has 8 cells filled — the last cell is determined!
62. R2C2=6 Forcing Chain/L4
Forcing Chain from R2C2: must be 6 — all other branches contradict
63. R2C1=9 Full House/L1
R2 has 8 cells filled — only one empty cell remains!
64. R8C2=9 Full House/L1
C2 has 8 cells filled — only one empty cell remains!
65. R4C8=1 Forcing Chain/L4
Forcing Chain from R4C8: must be 1 — all other branches contradict
66. R4C7=8 Full House/L1
R4 has 8 cells filled — only one empty cell remains!
67. R5C7=3 Forcing Chain/L4
Forcing Chain from R5C7: must be 3 — all other branches contradict
68. R5C9=2 Template/L6
Template: digit 2 always at R5C9 in all 1 valid patterns
69. R6C7=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 6
70. R8C7=2 Template/L6
Template: digit 2 always at R8C7 in all 1 valid patterns
71. R6C9=6 Forcing Chain/L4
Forcing Chain from R6C9: must be 6 — all other branches contradict
72. R6C8=7 Full House/L1
R6 has 8 cells filled — only one empty cell remains!
73. R9C1=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 7
74. R7C1=3 Template/L6
Template: digit 3 always at R7C1 in all 1 valid patterns
75. R8C3=6 Last Remaining/L1
Cross-hatching reveals 6 can only go in one cell in Box 7
76. R9C3=5 Full House/L1
C3 has 8 cells filled — only one empty cell remains!
77. R8C5=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 8
78. R7C5=1 Template/L6
Template: digit 1 always at R7C5 in all 1 valid patterns
79. R8C6=5 Last Remaining/L1
Cross-hatching reveals 5 can only go in one cell in Box 8
80. R9C6=7 Last RWSRF Player Solve Path
Puzzle: 100006020000000008053002700000920005040000090200031000008600540700000000010280009
Solution: 174856923962473158853192764637924815541768392289531476328619547796345281415287639
Date: 2026.03.03
Time: 00:56
Moves: 85
Max Level: L6
Shapes: Beam Scan:6 Force Vision:46 Ghost Signal:5 Zone Lock:25
Techniques: Pointing Pair:4 ALS-XY-Wing:4 Forcing Chain:19 Naked Triple:2 Naked Pair:2 Claiming:2 ALS-XZ:6 Template:16 Hidden Triple:1 Last Remaining:11 Hidden Single:1 Forcing Net:1 Full House:13
1. R2C8=5
2. R5C5=6
3. R9C7=6
4. ~R3C1-6 Pointing Pair/L3
Pointing Pair: 6 in Box 3 points along R3
5. ~R9C6-4 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=3, y=5, eliminates 4
6. ~R8C3-4 Pointing Pair/L3
Pointing Pair: 4 in Box 8 points along R8
7. ~R1C2-9 Forcing Chain/L4
Forcing Chain from R1C2: eliminate contradicted candidates
8. ~R3C5-1 Forcing Chain/L4
Forcing Chain from R3C5: eliminate contradicted candidates
9. ~R4C6-7 Forcing Chain/L4
Forcing Chain from R4C6: eliminate contradicted candidates
10. ~R5C1-3 Forcing Chain/L4
Forcing Chain from R5C1: eliminate contradicted candidates
11. ~R5C3-5 ~R5C3-7 ~R5C9-7 Naked Triple/L2
Naked Triple {5, 7, 8} in R5
12. R5C3=1 Forcing Chain/L4
Forcing Chain from R4C6: R5C3 must be 1
13. ~R4C7-3 ~R4C8-3 Naked Pair/L2
Naked Pair {2, 3} in Box 6
14. ~R6C4-7 Claiming/L3
Claiming: 7 in R5 is confined to Box 5
15. ~R7C9-3 ~R8C7-3 ~R8C9-3 Claiming/L3
Claiming: 3 in C8 is confined to Box 9
16. R5C4=7 Forcing Chain/L4
Forcing Chain from R3C8: R5C4 must be 7
17. ~R1C7-4 Forcing Chain/L4
Forcing Chain from R1C7: eliminate contradicted candidates
18. ~R2C1-4 Forcing Chain/L4
Forcing Chain from R2C1: eliminate contradicted candidates
19. ~R3C4-4 Forcing Chain/L4
Forcing Chain from R1C2: eliminate from R3C4
20. ~R3C5-4 Forcing Chain/L4
Forcing Chain from R3C5: eliminate contradicted candidates
21. R3C5=9 Forcing Chain/L4
Forcing Chain from R1C2: R3C5 must be 9
22. ~R2C3-4 ALS-XZ/L5
ALS-XZ: RCC=1, eliminates 4
23. ~R8C3-9 ALS-XZ/L5
ALS-XZ: RCC=6, eliminates 9
24. ~R8C6-4 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=9, y=5, eliminates 4
25. ~R8C5-5 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 5
26. R1C5=5 Forcing Chain/L4
Forcing Chain from R1C2: R1C5 must be 5
27. ~R2C2-7 ~R2C3-7 Pointing Pair/L3
Pointing Pair: 7 in Box 2 points along R2
28. ~R2C7-9 Naked Triple/L2
Naked Triple {2, 6, 9} in R2
29. R1C7=9 Forcing Chain/L4
Forcing Chain from R1C2: R1C7 must be 9
30. ~R4C8-6 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 6
31. ~R6C2-6 ~R6C3-6 Pointing Pair/L3
Pointing Pair: 6 in Box 6 points along R6
32. ~R8C2-2 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=5, y=9, eliminates 2
33. ~R6C3-5 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=8, y=2, eliminates 5
34. R5C1=5 Template/L6
Template: digit 5 always at R5C1 in all 2 valid patterns
35. R6C4=5 Template/L6
Template: digit 5 always at R6C4 in all 2 valid patterns
36. R4C6=4 Template/L6
Template: digit 4 always at R4C6 in all 5 valid patterns
37. R5C6=8 Template/L6
Template: digit 8 always at R5C6 in all 6 valid patterns
38. ~R8C3-2 ~R8C6-3 ~R8C2-3 Hidden Triple/L2
Hidden Triple {5, 6, 9} in R8
39. R7C2=2 Last Remaining/L1
Cross-hatching reveals 2 can only go in one cell in Box 7
40. R2C3=2 Template/L6
Template: digit 2 always at R2C3 in all 2 valid patterns
41. R4C2=3 Template/L6
Template: digit 3 always at R4C2 in all 5 valid patterns
42. R6C3=9 Template/L6
Template: digit 9 always at R6C3 in all 2 valid patterns
43. ~R7C6-7 Naked Pair/L2
Naked Pair {1, 7}WSRF Player Solve Path
Puzzle: 100006020000000008053002700000920005040000090200031000008600540700000000010280009
Solution: 174856923962473158853192764637924815541768392289531476328619547796345281415287639
Date: 2026.03.03
Time: 00:56
Moves: 85
Max Level: L6
Shapes: Beam Scan:6 Force Vision:46 Ghost Signal:5 Zone Lock:25
Techniques: Pointing Pair:4 ALS-XY-Wing:4 Forcing Chain:19 Naked Triple:2 Naked Pair:2 Claiming:2 ALS-XZ:6 Template:16 Hidden Triple:1 Last Remaining:11 Hidden Single:1 Forcing Net:1 Full House:13
1. R2C8=5
2. R5C5=6
3. R9C7=6
4. ~R3C1-6 Pointing Pair/L3
Pointing Pair: 6 in Box 3 points along R3
5. ~R9C6-4 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=3, y=5, eliminates 4
6. ~R8C3-4 Pointing Pair/L3
Pointing Pair: 4 in Box 8 points along R8
7. ~R1C2-9 Forcing Chain/L4
Forcing Chain from R1C2: eliminate contradicted candidates
8. ~R3C5-1 Forcing Chain/L4
Forcing Chain from R3C5: eliminate contradicted candidates
9. ~R4C6-7 Forcing Chain/L4
Forcing Chain from R4C6: eliminate contradicted candidates
10. ~R5C1-3 Forcing Chain/L4
Forcing Chain from R5C1: eliminate contradicted candidates
11. ~R5C3-5 ~R5C3-7 ~R5C9-7 Naked Triple/L2
Naked Triple {5, 7, 8} in R5
12. R5C3=1 Forcing Chain/L4
Forcing Chain from R4C6: R5C3 must be 1
13. ~R4C7-3 ~R4C8-3 Naked Pair/L2
Naked Pair {2, 3} in Box 6
14. ~R6C4-7 Claiming/L3
Claiming: 7 in R5 is confined to Box 5
15. ~R7C9-3 ~R8C7-3 ~R8C9-3 Claiming/L3
Claiming: 3 in C8 is confined to Box 9
16. R5C4=7 Forcing Chain/L4
Forcing Chain from R3C8: R5C4 must be 7
17. ~R1C7-4 Forcing Chain/L4
Forcing Chain from R1C7: eliminate contradicted candidates
18. ~R2C1-4 Forcing Chain/L4
Forcing Chain from R2C1: eliminate contradicted candidates
19. ~R3C4-4 Forcing Chain/L4
Forcing Chain from R1C2: eliminate from R3C4
20. ~R3C5-4 Forcing Chain/L4
Forcing Chain from R3C5: eliminate contradicted candidates
21. R3C5=9 Forcing Chain/L4
Forcing Chain from R1C2: R3C5 must be 9
22. ~R2C3-4 ALS-XZ/L5
ALS-XZ: RCC=1, eliminates 4
23. ~R8C3-9 ALS-XZ/L5
ALS-XZ: RCC=6, eliminates 9
24. ~R8C6-4 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=9, y=5, eliminates 4
25. ~R8C5-5 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 5
26. R1C5=5 Forcing Chain/L4
Forcing Chain from R1C2: R1C5 must be 5
27. ~R2C2-7 ~R2C3-7 Pointing Pair/L3
Pointing Pair: 7 in Box 2 points along R2
28. ~R2C7-9 Naked Triple/L2
Naked Triple {2, 6, 9} in R2
29. R1C7=9 Forcing Chain/L4
Forcing Chain from R1C2: R1C7 must be 9
30. ~R4C8-6 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 6
31. ~R6C2-6 ~R6C3-6 Pointing Pair/L3
Pointing Pair: 6 in Box 6 points along R6
32. ~R8C2-2 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=5, y=9, eliminates 2
33. ~R6C3-5 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=8, y=2, eliminates 5
34. R5C1=5 Template/L6
Template: digit 5 always at R5C1 in all 2 valid patterns
35. R6C4=5 Template/L6
Template: digit 5 always at R6C4 in all 2 valid patterns
36. R4C6=4 Template/L6
Template: digit 4 always at R4C6 in all 5 valid patterns
37. R5C6=8 Template/L6
Template: digit 8 always at R5C6 in all 6 valid patterns
38. ~R8C3-2 ~R8C6-3 ~R8C2-3 Hidden Triple/L2
Hidden Triple {5, 6, 9} in R8
39. R7C2=2 Last Remaining/L1
Cross-hatching reveals 2 can only go in one cell in Box 7
40. R2C3=2 Template/L6
Template: digit 2 always at R2C3 in all 2 valid patterns
41. R4C2=3 Template/L6
Template: digit 3 always at R4C2 in all 5 valid patterns
42. R6C3=9 Template/L6
Template: digit 9 always at R6C3 in all 2 valid patterns
43. ~R7C6-7 Naked Pair/L2
Naked Pair {1, 7} in R7
44. ~R2C4-3 ALS-XZ/L5
ALS-XZ: RCC=2, eliminates 3
45. ~R4C8-7 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 7
46. R4C3=7 Hidden Single/L2
7 can only go in one cell in R4
47. R1C2=7 Forcing Chain/L4
Forcing Chain from R1C2: must be 7 — all other branches contradict
48. R3C1=8 Last Remaining/L1
Cross-hatching reveals 8 can only go in one cell in Box 1
49. R1C3=4 Template/L6
Template: digit 4 always at R1C3 in all 2 valid patterns
50. R1C4=8 Forcing Chain/L4
Forcing Chain from R1C4: must be 8 — all other branches contradict
51. R1C9=3 Template/L6
Template: digit 3 always at R1C9 in all 1 valid patterns
52. R2C6=3 Template/L6
Template: digit 3 always at R2C6 in all 1 valid patterns
53. R2C5=7 Forcing Net/L5
Forcing Net from R2C5: must be 7 — all other branches contradict
54. R2C4=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 2
55. R3C4=1 Full House/L1
Box 2 has 8 cells filled — the last cell is determined!
56. R8C4=3 Full House/L1
C4 has 8 cells filled — only one empty cell remains!
57. R2C7=1 Template/L6
Template: digit 1 always at R2C7 in all 2 valid patterns
58. R3C9=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 3
59. R3C8=6 Full House/L1
R3 has 8 cells filled — only one empty cell remains!
60. R4C1=6 Last Remaining/L1
Cross-hatching reveals 6 can only go in one cell in Box 4
61. R6C2=8 Full House/L1
Box 4 has 8 cells filled — the last cell is determined!
62. R2C2=6 Forcing Chain/L4
Forcing Chain from R2C2: must be 6 — all other branches contradict
63. R2C1=9 Full House/L1
R2 has 8 cells filled — only one empty cell remains!
64. R8C2=9 Full House/L1
C2 has 8 cells filled — only one empty cell remains!
65. R4C8=1 Forcing Chain/L4
Forcing Chain from R4C8: must be 1 — all other branches contradict
66. R4C7=8 Full House/L1
R4 has 8 cells filled — only one empty cell remains!
67. R5C7=3 Forcing Chain/L4
Forcing Chain frWSRF Player Solve Path
Puzzle: 100006020000000008053002700000920005040000090200031000008600540700000000010280009
Solution: 174856923962473158853192764637924815541768392289531476328619547796345281415287639
Date: 2026.03.03
Time: 00:56
Moves: 85
Max Level: L6
Shapes: Beam Scan:6 Force Vision:46 Ghost Signal:5 Zone Lock:25
Techniques: Pointing Pair:4 ALS-XY-Wing:4 Forcing Chain:19 Naked Triple:2 Naked Pair:2 Claiming:2 ALS-XZ:6 Template:16 Hidden Triple:1 Last Remaining:11 Hidden Single:1 Forcing Net:1 Full House:13
1. R2C8=5
2. R5C5=6
3. R9C7=6
4. ~R3C1-6 Pointing Pair/L3
Pointing Pair: 6 in Box 3 points along R3
5. ~R9C6-4 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=3, y=5, eliminates 4
6. ~R8C3-4 Pointing Pair/L3
Pointing Pair: 4 in Box 8 points along R8
7. ~R1C2-9 Forcing Chain/L4
Forcing Chain from R1C2: eliminate contradicted candidates
8. ~R3C5-1 Forcing Chain/L4
Forcing Chain from R3C5: eliminate contradicted candidates
9. ~R4C6-7 Forcing Chain/L4
Forcing Chain from R4C6: eliminate contradicted candidates
10. ~R5C1-3 Forcing Chain/L4
Forcing Chain from R5C1: eliminate contradicted candidates
11. ~R5C3-5 ~R5C3-7 ~R5C9-7 Naked Triple/L2
Naked Triple {5, 7, 8} in R5
12. R5C3=1 Forcing Chain/L4
Forcing Chain from R4C6: R5C3 must be 1
13. ~R4C7-3 ~R4C8-3 Naked Pair/L2
Naked Pair {2, 3} in Box 6
14. ~R6C4-7 Claiming/L3
Claiming: 7 in R5 is confined to Box 5
15. ~R7C9-3 ~R8C7-3 ~R8C9-3 Claiming/L3
Claiming: 3 in C8 is confined to Box 9
16. R5C4=7 Forcing Chain/L4
Forcing Chain from R3C8: R5C4 must be 7
17. ~R1C7-4 Forcing Chain/L4
Forcing Chain from R1C7: eliminate contradicted candidates
18. ~R2C1-4 Forcing Chain/L4
Forcing Chain from R2C1: eliminate contradicted candidates
19. ~R3C4-4 Forcing Chain/L4
Forcing Chain from R1C2: eliminate from R3C4
20. ~R3C5-4 Forcing Chain/L4
Forcing Chain from R3C5: eliminate contradicted candidates
21. R3C5=9 Forcing Chain/L4
Forcing Chain from R1C2: R3C5 must be 9
22. ~R2C3-4 ALS-XZ/L5
ALS-XZ: RCC=1, eliminates 4
23. ~R8C3-9 ALS-XZ/L5
ALS-XZ: RCC=6, eliminates 9
24. ~R8C6-4 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=9, y=5, eliminates 4
25. ~R8C5-5 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 5
26. R1C5=5 Forcing Chain/L4
Forcing Chain from R1C2: R1C5 must be 5
27. ~R2C2-7 ~R2C3-7 Pointing Pair/L3
Pointing Pair: 7 in Box 2 points along R2
28. ~R2C7-9 Naked Triple/L2
Naked Triple {2, 6, 9} in R2
29. R1C7=9 Forcing Chain/L4
Forcing Chain from R1C2: R1C7 must be 9
30. ~R4C8-6 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 6
31. ~R6C2-6 ~R6C3-6 Pointing Pair/L3
Pointing Pair: 6 in Box 6 points along R6
32. ~R8C2-2 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=5, y=9, eliminates 2
33. ~R6C3-5 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=8, y=2, eliminates 5
34. R5C1=5 Template/L6
Template: digit 5WSRF Player Solve Path
Puzzle: 100006020000000008053002700000920005040000090200031000008600540700000000010280009
Solution: 174856923962473158853192764637924815541768392289531476328619547796345281415287639
Date: 2026.03.03
Time: 00:56
Moves: 85
Max Level: L6
Shapes: Beam Scan:6 Force Vision:46 Ghost Signal:5 Zone Lock:25
Techniques: Pointing Pair:4 ALS-XY-Wing:4 Forcing Chain:19 Naked Triple:2 Naked Pair:2 Claiming:2 ALS-XZ:6 Template:16 Hidden Triple:1 Last Remaining:11 Hidden Single:1 Forcing Net:1 Full House:13
1. R2C8=5
2. R5C5=6
3. R9C7=6
4. ~R3C1-6 Pointing Pair/L3
Pointing Pair: 6 in Box 3 points along R3
5. ~R9C6-4 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=3, y=5, eliminates 4
6. ~R8C3-4 Pointing Pair/L3
Pointing Pair: 4 in Box 8 points along R8
7. ~R1C2-9 Forcing Chain/L4
Forcing Chain from R1C2: eliminate contradicted candidates
8. ~R3C5-1 Forcing Chain/L4
Forcing Chain from R3C5: eliminate contradicted candidates
9. ~R4C6-7 Forcing Chain/L4
Forcing Chain from R4C6: eliminate contradicted candidates
10. ~R5C1-3 Forcing Chain/L4
Forcing Chain from R5C1: eliminate contradicted candidates
11. ~R5C3-5 ~R5C3-7 ~R5C9-7 Naked Triple/L2
Naked Triple {5, 7, 8} in R5
12. R5C3=1 Forcing Chain/L4
Forcing Chain from R4C6: R5C3 must be 1
13. ~R4C7-3 ~R4C8-3 Naked Pair/L2
Naked Pair {2, 3} in Box 6
14. ~R6C4-7 Claiming/L3
Claiming: 7 in R5 is confined to Box 5
15. ~R7C9-3 ~R8C7-3 ~R8C9-3 Claiming/L3
Claiming: 3 in C8 is confined to Box 9
16. R5C4=7 Forcing Chain/L4
Forcing Chain from R3C8: R5C4 must be 7
17. ~R1C7-4 Forcing Chain/L4
Forcing Chain from R1C7: eliminate contradicted candidates
18. ~R2C1-4 Forcing Chain/L4
Forcing Chain from R2C1: eliminate contradicted candidates
19. ~R3C4-4 Forcing Chain/L4
Forcing Chain from R1C2: eliminate from R3C4
20. ~R3C5-4 Forcing Chain/L4
Forcing Chain from R3C5: eliminate contradicted candidates
21. R3C5=9 Forcing Chain/L4
Forcing Chain from R1C2: R3C5 must be 9
22. ~R2C3-4 ALS-XZ/L5
ALS-XZ: RCC=1, eliminates 4
23. ~R8C3-9 ALS-XZ/L5
ALS-XZ: RCC=6, eliminates 9
24. ~R8C6-4 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=9, y=5, eliminates 4
25. ~R8C5-5 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 5
26. R1C5=5 Forcing Chain/L4
Forcing Chain from R1C2: R1C5 must be 5
27. ~R2C2-7 ~R2C3-7 Pointing Pair/L3
Pointing Pair: 7 in Box 2 points along R2
28. ~R2C7-9 Naked Triple/L2
Naked Triple {2, 6, 9} in R2
29. R1C7=9 Forcing Chain/L4
Forcing Chain from R1C2: R1C7 must be 9
30. ~R4C8-6 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 6
31. ~R6C2-6 ~R6C3-6 Pointing Pair/L3
Pointing Pair: 6 in Box 6 points along R6
32. ~R8C2-2 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=5, y=9, eliminates 2
33. ~R6C3-5 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=8, y=2, eliminates 5
34. R5C1=5 Template/L6
Template: digit 5 always at R5C1 in all 2 valid patterns
35. R6C4=5 Template/L6
Template: digit 5 always at R6C4 in all 2 valid patterns
36. R4C6=4 Template/L6
Template: digit 4 always at R4C6 in all 5 valid patterns
37. R5C6=8 Template/L6
Template: digit 8 always at R5C6 in all 6 valid patterns
38. ~R8C3-2 ~R8C6-3 ~R8C2-3 Hidden Triple/L2
Hidden Triple {5, 6, 9} in R8
39. R7C2=2 Last Remaining/L1
Cross-hatching reveals 2 can only go in one cell in Box 7
40. R2C3=2 Template/L6
Template: digit 2 always at R2C3 in all 2 valid patterns
41. R4C2=3 Template/L6
Template: digit 3 always at R4C2 in all 5 valid patterns
42. R6C3=9 Template/L6
Template: digit 9 always at R6C3 in all 2 valid patterns
43. ~R7C6-7 Naked Pair/L2
Naked Pair {1, 7} in R7
44. ~R2C4-3 ALS-XZ/L5
ALS-XZ: RCC=2, eliminates 3
45. ~R4C8-7 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 7
46. R4C3=7 Hidden Single/L2
7 can only go in one cell in R4
47. R1C2=7 Forcing Chain/L4
Forcing Chain from R1C2: must be 7 — all other branches contradict
48. R3C1=8 Last Remaining/L1
Cross-hatching reveals 8 can only go in one cell in Box 1
49. R1C3=4 Template/L6
Template: digit 4 always at R1C3 in all 2 valid patterns
50. R1C4=8 Forcing Chain/L4
Forcing Chain from R1C4: must be 8 — all other branches contradict
51. R1C9=3 Template/L6
Template: digit 3 always at R1C9 in all 1 valid patterns
52. R2C6=3 Template/L6
Template: digit 3 always at R2C6 in all 1 valid patterns
53. R2C5=7 Forcing Net/L5
Forcing Net from R2C5: must be 7 — all other branches contradict
54. R2C4=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 2
55. R3C4=1 Full House/L1
Box 2 has 8 cells filled — the last cell is determined!
56. R8C4=3 Full House/L1
C4 has 8 cells filled — only one empty cell remains!
57. R2C7=1 Template/L6
Template: digit 1 always at R2C7 in all 2 valid patterns
58. R3C9=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 3
59. R3C8=6 Full House/L1
R3 has 8 cells filled — only one empty cell remains!
60. R4C1=6 Last Remaining/L1
Cross-hatching reveals 6 can only go in one cell in Box 4
61. R6C2=8 Full House/L1
Box 4 has 8 cells filled — the last cell is determined!
62. R2C2=6 Forcing Chain/L4
Forcing Chain from R2C2: must be 6 — all other branches contradict
63. R2C1=9 Full House/L1
R2 has 8 cells filled — only one empty cell remains!
64. R8C2=9 Full House/L1
C2 has 8 cells filled — only one empty cell remains!
65. R4C8=1 Forcing Chain/L4
Forcing Chain from R4C8: must be 1 — all other branches contradict
66. R4C7=8 Full House/L1
R4 has 8 cells filled — only one empty cell remains!
67. R5C7=3 Forcing Chain/L4
Forcing Chain from R5C7: must be 3 — all other branches contradict
68. R5C9=2 Template/L6
Template: digit 2 always at R5C9 in all 1 valid patterns
69. R6C7=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 6
70. R8C7=2 Template/L6
Template: digit 2 always at R8C7 in all 1 valid patterns
71. R6C9=6 Forcing Chain/L4
Forcing Chain from R6C9: must be 6 — all other branches contradict
72. R6C8=7 Full House/L1
R6 has 8 cells filled — only one empty cell remains!
73. R9C1=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 7
74. R7C1=3 Template/L6
Template: digit 3 always at R7C1 in all 1 valid patterns
75. R8C3=6 Last Remaining/L1
Cross-hatching reveals 6 can only go in one cell in Box 7
76. R9C3=5 Full House/L1
C3 has 8 cells filled — only one empty cell remains!
77. R8C5=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 8
78. R7C5=1 Template/L6
Template: digit 1 always at R7C5 in all 1 valid patterns
79. R8C6=5 Last Remaining/L1
Cross-hatching reveals 5 can only go in one cell in Box 8
80. R9C6=7 Last Remaining/L1
Cross-hatching reveals 7 can only go in one cell in Box 8
81. R9C8=3 Full House/L1
R9 has 8 cells filled — only one empty cell remains!
82. R7C6=9 Full House/L1
C6 has 8 cells filled — only one empty cell remains!
83. R7C9=7 Full House/L1
R7 has 8 cells filled — only one empty cell remains!
84. R8C8=8 Full House/L1
C8 has 8 cells filled — only one empty cell remains!
85. R8C9=1 Template/L6
Template: digit 1 always at R8C9 in all 1 valid patterns always at R5C1 in all 2 valid patterns
35. R6C4=5 Template/L6
Template: digit 5 always at R6C4 in all 2 valid patterns
36. R4C6=4 Template/L6
Template: digit 4 always at R4C6 in all 5 valid patterns
37. R5C6=8 Template/L6
Template: digit 8 always at R5C6 in all 6 valid patterns
38. ~R8C3-2 ~R8C6-3 ~R8C2-3 Hidden Triple/L2
Hidden Triple {5, 6, 9} in R8
39. R7C2=2 Last Remaining/L1
Cross-hatching reveals 2 can only go in one cell in Box 7
40. R2C3=2 Template/L6
Template: digit 2 always at R2C3 in all 2 valid patterns
41. R4C2=3 Template/L6
Template: digit 3 always at R4C2 in all 5 valid patterns
42. R6C3=9 Template/L6
Template: digit 9 always at R6C3 in all 2 valid patterns
43. ~R7C6-7 Naked Pair/L2
Naked Pair {1, 7} in R7
44. ~R2C4-3 ALS-XZ/L5
ALS-XZ: RCC=2, eliminates 3
45. ~R4C8-7 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 7
46. R4C3=7 Hidden Single/L2
7 can only go in one cell in R4
47. R1C2=7 Forcing Chain/L4
Forcing Chain from R1C2: must be 7 — all other branches contradict
48. R3C1=8 Last Remaining/L1
Cross-hatching reveals 8 can only go in one cell in Box 1
49. R1C3=4 Template/L6
Template: digit 4 always at R1C3 in all 2 valid patterns
50. R1C4=8 Forcing Chain/L4
Forcing Chain from R1C4: must be 8 — all other branches contradict
51. R1C9=3 Template/L6
Template: digit 3 always at R1C9 in all 1 valid patterns
52. R2C6=3 Template/L6
Template: digit 3 always at R2C6 in all 1 valid patterns
53. R2C5=7 Forcing Net/L5
Forcing Net from R2C5: must be 7 — all other branches contradict
54. R2C4=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 2
55. R3C4=1 Full House/L1
Box 2 has 8 cells filled — the last cell is determined!
56. R8C4=3 Full House/L1
C4 has 8 cells filled — only one empty cell remains!
57. R2C7=1 Template/L6
Template: digit 1 always at R2C7 in all 2 valid patterns
58. R3C9=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 3
59. R3C8=6 Full House/L1
R3 has 8 cells filled — only one empty cell remains!
60. R4C1=6 Last Remaining/L1
Cross-hatching reveals 6 can only go in one cell in Box 4
61. R6C2=8 Full House/L1
Box 4 has 8 cells filled — the last cell is determined!
62. R2C2=6 Forcing Chain/L4
Forcing Chain from R2C2: must be 6 — all other branches contradict
63. R2C1=9 Full House/L1
R2 has 8 cells filled — only one empty cell remains!
64. R8C2=9 Full House/L1
C2 has 8 cells filled — only one empty cell remains!
65. R4C8=1 Forcing Chain/L4
Forcing Chain from R4C8: must be 1 — all other branches contradict
66. R4C7=8 Full House/L1
R4 has 8 cells filled — only one empty cell remains!
67. R5C7=3 Forcing Chain/L4
Forcing Chain from R5C7: must be 3 — all other branches contradict
68. R5C9=2 Template/L6
Template: digit 2 always at R5C9 in all 1 valid patterns
69. R6C7=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 6
70. R8C7=2 Template/L6
Template: digit 2 always at R8C7 in all 1 valid patterns
71. R6C9=6 Forcing Chain/L4
Forcing Chain from R6C9: must be 6 — all other branches contradict
72. R6C8=7 Full House/L1
R6 has 8 cells filled — only one empty cell remains!
73. R9C1=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 7
74. R7C1=3 Template/L6
Template: digit 3 always at R7C1 in all 1 valid patterns
75. R8C3=6 Last Remaining/L1
Cross-hatching reveals 6 can only go in one cell in Box 7
76. R9C3=5 Full House/L1
C3 has 8 cells filled — only one empty cell remains!
77. R8C5=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 8
78. R7C5=1 Template/L6
Template: digit 1 always at R7C5 in all 1 valid patterns
79. R8C6=5 Last Remaining/L1
Cross-hatching reveals 5 can only go in one cell in Box 8
80. R9C6=7 Last Remaining/L1
Cross-hatching reveals 7 can only go in one cell in Box 8
81. R9C8=3 Full House/L1
R9 has 8 cells filled — only one empty cell remains!
82. R7C6=9 Full House/L1
C6 has 8 cells filled — only one empty cell remains!
83. R7C9=7 Full House/L1
R7 has 8 cells filled — only one empty cell remains!
84. R8C8=8 Full House/L1
C8 has 8 cells filled — only one empty cell remains!
85. R8C9=1 Template/L6
Template: digit 1 always at R8C9 in all 1 valid patternsom R5C7: must be 3 — all other branches contradict
68. R5C9=2 Template/L6
Template: digit 2 always at R5C9 in all 1 valid patterns
69. R6C7=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 6
70. R8C7=2 Template/L6
Template: digit 2 always at R8C7 in all 1 valid patterns
71. R6C9=6 Forcing Chain/L4
Forcing Chain from R6C9: must be 6 — all other branches contradict
72. R6C8=7 Full House/L1
R6 has 8 cells filled — only one empty cell remains!
73. R9C1=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 7
74. R7C1=3 Template/L6
Template: digit 3 always at R7C1 in all 1 valid patterns
75. R8C3=6 Last Remaining/L1
Cross-hatching reveals 6 can only go in one cell in Box 7
76. R9C3=5 Full House/L1
C3 has 8 cells filled — only one empty cell remains!
77. R8C5=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 8
78. R7C5=1 Template/L6
Template: digit 1 always at R7C5 in all 1 valid patterns
79. R8C6=5 Last Remaining/L1
Cross-hatching reveals 5 can only go in one cell in Box 8
80. R9C6=7 Last Remaining/L1
Cross-hatching reveals 7 can only go in one cell in Box 8
81. R9C8=3 Full House/L1
R9 has 8 cells filled — only one empty cell remains!
82. R7C6=9 Full House/L1
C6 has 8 cells filled — only one empty cell remains!
83. R7C9=7 Full House/L1
R7 has 8 cells filled — only one empty cell remains!
84. R8C8=8 Full House/L1
C8 has 8 cells filled — only one empty cell remains!
85. R8C9=1 Template/L6
Template: digit 1 always at R8C9 in all 1 valid patterns in R7
44. ~R2C4-3 ALS-XZ/L5
ALS-XZ: RCC=2, eliminates 3
45. ~R4C8-7 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 7
46. R4C3=7 Hidden Single/L2
7 can only go in one cell in R4
47. R1C2=7 Forcing Chain/L4
Forcing Chain from R1C2: must be 7 — all other branches contradict
48. R3C1=8 Last Remaining/L1
Cross-hatching reveals 8 can only go in one cell in Box 1
49. R1C3=4 Template/L6
Template: digit 4 always at R1C3 in all 2 valid patterns
50. R1C4=8 Forcing Chain/L4
Forcing Chain from R1C4: must be 8 — all other branches contradict
51. R1C9=3 Template/L6
Template: digit 3 always at R1C9 in all 1 valid patterns
52. R2C6=3 Template/L6
Template: digit 3 always at R2C6 in all 1 valid patterns
53. R2C5=7 Forcing Net/L5
Forcing Net from R2C5: must be 7 — all other branches contradict
54. R2C4=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 2
55. R3C4=1 Full House/L1
Box 2 has 8 cells filled — the last cell is determined!
56. R8C4=3 Full House/L1
C4 has 8 cells filled — only one empty cell remains!
57. R2C7=1 Template/L6
Template: digit 1 always at R2C7 in all 2 valid patterns
58. R3C9=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 3
59. R3C8=6 Full House/L1
R3 has 8 cells filled — only one empty cell remains!
60. R4C1=6 Last Remaining/L1
Cross-hatching reveals 6 can only go in one cell in Box 4
61. R6C2=8 Full House/L1
Box 4 has 8 cells filled — the last cell is determined!
62. R2C2=6 Forcing Chain/L4
Forcing Chain from R2C2: must be 6 — all other branches contradict
63. R2C1=9 Full House/L1
R2 has 8 cells filled — only one empty cell remains!
64. R8C2=9 Full House/L1
C2 has 8 cells filled — only one empty cell remains!
65. R4C8=1 Forcing Chain/L4
Forcing Chain from R4C8: must be 1 — all other branches contradict
66. R4C7=8 Full House/L1
R4 has 8 cells filled — only one empty cell remains!
67. R5C7=3 Forcing Chain/L4
Forcing Chain from R5C7: must be 3 — all other branches contradict
68. R5C9=2 Template/L6
Template: digit 2 always at R5C9 in all 1 valid patterns
69. R6C7=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 6
70. R8C7=2 Template/L6
Template: digit 2 always at R8C7 in all 1 valid patterns
71. R6C9=6 Forcing Chain/L4
Forcing Chain from R6C9: must be 6 — all other branches contradict
72. R6C8=7 Full House/L1
R6 has 8 cells filled — only one empty cell remains!
73. R9C1=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 7
74. R7C1=3 Template/L6
Template: digit 3 always at R7C1 in all 1 valid patterns
75. R8C3=6 Last Remaining/L1
Cross-hatching reveals 6 can only go in one cell in Box 7
76. R9C3=5 Full House/L1
C3 has 8 cells filled — only one empty cell remains!
77. R8C5=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 8
78. R7C5=1 Template/L6
Template: digit 1 always at R7C5 in all 1 valid patterns
79. R8C6=5 Last Remaining/L1
Cross-hatching reveals 5 can only go in one cell in Box 8
80. R9C6=7 Last Remaining/L1
Cross-hatching reveals 7 can only go in one cell in Box 8
81. R9C8=3 Full House/L1
R9 has 8 cells filled — only one empty cell remains!
82. R7C6=9 Full House/L1
C6 has 8 cells filled — only one empty cell remains!
83. R7C9=7 Full House/L1
R7 has 8 cells filled — only one empty cell remains!
84. R8C8=8 Full House/L1
C8 has 8 cells filled — only one empty cell remains!
85. R8C9=1 Template/L6
Template: digit 1 always at R8C9 in all 1 valid patternsemaining/L1
Cross-hatching reveals 7 can only go in one cell in Box 8
81. R9C8=3 Full House/L1
R9 has 8 cells filled — only one empty cell remains!
82. R7C6=9 Full House/L1
C6 has 8 cells filled — only one empty cell remains!
83. R7C9=7 Full House/L1
R7 has 8 cells filled — only one empty cell remains!
84. R8C8=8 Full House/L1
C8 has 8 cells filled — only one empty cell remains!
85. R8C9=1 Template/L6
Template: digit 1 always at R8C9 in all 1 valid patternsuse/L1
R7 has 8 cells filled — only one empty cell remains!
84. R8C8=8 Full House/L1
C8 has 8 cells filled — only one empty cell remains!
85. R8C9=1 Template/L6
Template: digit 1 always at R8C9 in all 1 valid patternsuse/L1
R7 has 8 cells filled — only one empty cell remains!
84. R8C8=8 Full House/L1
C8 has 8 cells filled — only one empty cell remains!
85. R8C9=1 Template/L6
Template: digit 1 always at R8C9 in all 1 valid patternseveals 8 can only go in one cell in Box 1
49. R1C3=4 Template/L6
Template: digit 4 always at R1C3 in all 2 valid patterns
50. R1C4=8 Forcing Chain/L4
Forcing Chain from R1C4: must be 8 — all other branches contradict
51. R1C9=3 Template/L6
Template: digit 3 always at R1C9 in all 1 valid patterns
52. R2C6=3 Template/L6
Template: digit 3 always at R2C6 in all 1 valid patterns
53. R2C5=7 ForcinWSRF Player Solve Path
Puzzle: 100006020000000008053002700000920005040000090200031000008600540700000000010280009
Solution: 174856923962473158853192764637924815541768392289531476328619547796345281415287639
Date: 2026.03.03
Time: 00:56
Moves: 85
Max Level: L6
Shapes: Beam Scan:6 Force Vision:46 Ghost Signal:5 Zone Lock:25
Techniques: Pointing Pair:4 ALS-XY-Wing:4 Forcing Chain:19 Naked Triple:2 Naked Pair:2 Claiming:2 ALS-XZ:6 Template:16 Hidden Triple:1 Last Remaining:11 Hidden Single:1 Forcing Net:1 Full House:13
1. R2C8=5
2. R5C5=6
3. R9C7=6
4. ~R3C1-6 Pointing Pair/L3
Pointing Pair: 6 in Box 3 points along R3
5. ~R9C6-4 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=3, y=5, eliminates 4
6. ~R8C3-4 Pointing Pair/L3
Pointing Pair: 4 in Box 8 points along R8
7. ~R1C2-9 Forcing Chain/L4
Forcing Chain from R1C2: eliminate contradicted candidates
8. ~R3C5-1 Forcing Chain/L4
Forcing Chain from R3C5: eliminate contradicted candidates
9. ~R4C6-7 Forcing Chain/L4
Forcing Chain from R4C6: eliminate contradicted candidates
10. ~R5C1-3 Forcing Chain/L4
Forcing Chain from R5C1: eliminate contradicted candidates
11. ~R5C3-5 ~R5C3-7 ~R5C9-7 Naked Triple/L2
Naked Triple {5, 7, 8} in R5
12. R5C3=1 Forcing Chain/L4
Forcing Chain from R4C6: R5C3 must be 1
13. ~R4C7-3 ~R4C8-3 Naked Pair/L2
Naked Pair {2, 3} in Box 6
14. ~R6C4-7 Claiming/L3
Claiming: 7 in R5 is confined to Box 5
15. ~R7C9-3 ~R8C7-3 ~R8C9-3 Claiming/L3
Claiming: 3 in C8 is confined to Box 9
16. R5C4=7 Forcing Chain/L4
Forcing Chain from R3C8: R5C4 must be 7
17. ~R1C7-4 Forcing Chain/L4
Forcing Chain from R1C7: eliminate contradicted candidates
18. ~R2C1-4 Forcing Chain/L4
Forcing Chain from R2C1: eliminate contradicted candidates
19. ~R3C4-4 Forcing Chain/L4
Forcing Chain from R1C2: eliminate from R3C4
20. ~R3C5-4 Forcing Chain/L4
Forcing Chain from R3C5: eliminate contradicted candidates
21. R3C5=9 Forcing Chain/L4
Forcing Chain from R1C2: R3C5 must be 9
22. ~R2C3-4 ALS-XZ/L5
ALS-XZ: RCC=1, eliminates 4
23. ~R8C3-9 ALS-XZ/L5
ALS-XZ: RCC=6, eliminates 9
24. ~R8C6-4 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=9, y=5, eliminates 4
25. ~R8C5-5 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 5
26. R1C5=5 Forcing Chain/L4
Forcing Chain from R1C2: R1C5 must be 5
27. ~R2C2-7 ~R2C3-7 Pointing Pair/L3
Pointing Pair: 7 in Box 2 points along R2
28. ~R2C7-9 Naked Triple/L2
Naked Triple {2, 6, 9} in R2
29. R1C7=9 Forcing Chain/L4
Forcing Chain from R1C2: R1C7 must be 9
30. ~R4C8-6 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 6
31. ~R6C2-6 ~R6C3-6 Pointing Pair/L3
Pointing Pair: 6 in Box 6 points along R6
32. ~R8C2-2 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=5, y=9, eliminates 2
33. ~R6C3-5 ALS-XY-Wing/L5
ALS-XY-Wing: RCC x=8, y=2, eliminates 5
34. R5C1=5 Template/L6
Template: digit 5 always at R5C1 in all 2 valid patterns
35. R6C4=5 Template/L6
Template: digit 5 always at R6C4 in all 2 valid patterns
36. R4C6=4 Template/L6
Template: digit 4 always at R4C6 in all 5 valid patterns
37. R5C6=8 Template/L6
Template: digit 8 always at R5C6 in all 6 valid patterns
38. ~R8C3-2 ~R8C6-3 ~R8C2-3 Hidden Triple/L2
Hidden Triple {5, 6, 9} in R8
39. R7C2=2 Last Remaining/L1
Cross-hatching reveals 2 can only go in one cell in Box 7
40. R2C3=2 Template/L6
Template: digit 2 always at R2C3 in all 2 valid patterns
41. R4C2=3 Template/L6
Template: digit 3 always at R4C2 in all 5 valid patterns
42. R6C3=9 Template/L6
Template: digit 9 always at R6C3 in all 2 valid patterns
43. ~R7C6-7 Naked Pair/L2
Naked Pair {1, 7} in R7
44. ~R2C4-3 ALS-XZ/L5
ALS-XZ: RCC=2, eliminates 3
45. ~R4C8-7 ALS-XZ/L5
ALS-XZ: RCC=4, eliminates 7
46. R4C3=7 Hidden Single/L2
7 can only go in one cell in R4
47. R1C2=7 Forcing Chain/L4
Forcing Chain from R1C2: must be 7 — all other branches contradict
48. R3C1=8 Last Remaining/L1
Cross-hatching reveals 8 can only go in one cell in Box 1
49. R1C3=4 Template/L6
Template: digit 4 always at R1C3 in all 2 valid patterns
50. R1C4=8 Forcing Chain/L4
Forcing Chain from R1C4: must be 8 — all other branches contradict
51. R1C9=3 Template/L6
Template: digit 3 always at R1C9 in all 1 valid patterns
52. R2C6=3 Template/L6
Template: digit 3 always at R2C6 in all 1 valid patterns
53. R2C5=7 Forcing Net/L5
Forcing Net from R2C5: must be 7 — all other branches contradict
54. R2C4=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 2
55. R3C4=1 Full House/L1
Box 2 has 8 cells filled — the last cell is determined!
56. R8C4=3 Full House/L1
C4 has 8 cells filled — only one empty cell remains!
57. R2C7=1 Template/L6
Template: digit 1 always at R2C7 in all 2 valid patterns
58. R3C9=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 3
59. R3C8=6 Full House/L1
R3 has 8 cells filled — only one empty cell remains!
60. R4C1=6 Last Remaining/L1
Cross-hatching reveals 6 can only go in one cell in Box 4
61. R6C2=8 Full House/L1
Box 4 has 8 cells filled — the last cell is determined!
62. R2C2=6 Forcing Chain/L4
Forcing Chain from R2C2: must be 6 — all other branches contradict
63. R2C1=9 Full House/L1
R2 has 8 cells filled — only one empty cell remains!
64. R8C2=9 Full House/L1
C2 has 8 cells filled — only one empty cell remains!
65. R4C8=1 Forcing Chain/L4
Forcing Chain from R4C8: must be 1 — all other branches contradict
66. R4C7=8 Full House/L1
R4 has 8 cells filled — only one empty cell remains!
67. R5C7=3 Forcing Chain/L4
Forcing Chain from R5C7: must be 3 — all other branches contradict
68. R5C9=2 Template/L6
Template: digit 2 always at R5C9 in all 1 valid patterns
69. R6C7=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 6
70. R8C7=2 Template/L6
Template: digit 2 always at R8C7 in all 1 valid patterns
71. R6C9=6 Forcing Chain/L4
Forcing Chain from R6C9: must be 6 — all other branches contradict
72. R6C8=7 Full House/L1
R6 has 8 cells filled — only one empty cell remains!
73. R9C1=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 7
74. R7C1=3 Template/L6
Template: digit 3 always at R7C1 in all 1 valid patterns
75. R8C3=6 Last Remaining/L1
Cross-hatching reveals 6 can only go in one cell in Box 7
76. R9C3=5 Full House/L1
C3 has 8 cells filled — only one empty cell remains!
77. R8C5=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 8
78. R7C5=1 Template/L6
Template: digit 1 always at R7C5 in all 1 valid patterns
79. R8C6=5 Last Remaining/L1
Cross-hatching reveals 5 can only go in one cell in Box 8
80. R9C6=7 Last Remaining/L1
Cross-hatching reveals 7 can only go in one cell in Box 8
81. R9C8=3 Full House/L1
R9 has 8 cells filled — only one empty cell remains!
82. R7C6=9 Full House/L1
C6 has 8 cells filled — only one empty cell remains!
83. R7C9=7 Full House/L1
R7 has 8 cells filled — only one empty cell remains!
84. R8C8=8 Full House/L1
C8 has 8 cells filled — only one empty cell remains!
85. R8C9=1 Template/L6
Template: digit 1 always at R8C9 in all 1 valid patternsg Net/L5
Forcing Net from R2C5: must be 7 — all other branches contradict
54. R2C4=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 2
55. R3C4=1 Full House/L1
Box 2 has 8 cells filled — the last cell is determined!
56. R8C4=3 Full House/L1
C4 has 8 cells filled — only one empty cell remains!
57. R2C7=1 Template/L6
Template: digit 1 always at R2C7 in all 2 valid patterns
58. R3C9=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 3
59. R3C8=6 Full House/L1
R3 has 8 cells filled — only one empty cell remains!
60. R4C1=6 Last Remaining/L1
Cross-hatching reveals 6 can only go in one cell in Box 4
61. R6C2=8 Full House/L1
Box 4 has 8 cells filled — the last cell is determined!
62. R2C2=6 Forcing Chain/L4
Forcing Chain from R2C2: must be 6 — all other branches contradict
63. R2C1=9 Full House/L1
R2 has 8 cells filled — only one empty cell remains!
64. R8C2=9 Full House/L1
C2 has 8 cells filled — only one empty cell remains!
65. R4C8=1 Forcing Chain/L4
Forcing Chain from R4C8: must be 1 — all other branches contradict
66. R4C7=8 Full House/L1
R4 has 8 cells filled — only one empty cell remains!
67. R5C7=3 Forcing Chain/L4
Forcing Chain from R5C7: must be 3 — all other branches contradict
68. R5C9=2 Template/L6
Template: digit 2 always at R5C9 in all 1 valid patterns
69. R6C7=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 6
70. R8C7=2 Template/L6
Template: digit 2 always at R8C7 in all 1 valid patterns
71. R6C9=6 Forcing Chain/L4
Forcing Chain from R6C9: must be 6 — all other branches contradict
72. R6C8=7 Full House/L1
R6 has 8 cells filled — only one empty cell remains!
73. R9C1=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 7
74. R7C1=3 Template/L6
Template: digit 3 always at R7C1 in all 1 valid patterns
75. R8C3=6 Last Remaining/L1
Cross-hatching reveals 6 can only go in one cell in Box 7
76. R9C3=5 Full House/L1
C3 has 8 cells filled — only one empty cell remains!
77. R8C5=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 8
78. R7C5=1 Template/L6
Template: digit 1 always at R7C5 in all 1 valid patterns
79. R8C6=5 Last Remaining/L1
Cross-hatching reveals 5 can only go in one cell in Box 8
80. R9C6=7 Last Remaining/L1
Cross-hatching reveals 7 can only go in one cell in Box 8
81. R9C8=3 Full House/L1
R9 has 8 cells filled — only one empty cell remains!
82. R7C6=9 Full House/L1
C6 has 8 cells filled — only one empty cell remains!
83. R7C9=7 Full House/L1
R7 has 8 cells filled — only one empty cell remains!
84. R8C8=8 Full House/L1
C8 has 8 cells filled — only one empty cell remains!
85. R8C9=1 Template/L6
Template: digit 1 always at R8C9 in all 1 valid patternsg Chain/L4
Forcing Chain from R6C9: must be 6 — all other branches contradict
72. R6C8=7 Full House/L1
R6 has 8 cells filled — only one empty cell remains!
73. R9C1=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 7
74. R7C1=3 Template/L6
Template: digit 3 always at R7C1 in all 1 valid patterns
75. R8C3=6 Last Remaining/L1
Cross-hatching reveals 6 can only go in one cell in Box 7
76. R9C3=5 Full House/L1
C3 has 8 cells filled — only one empty cell remains!
77. R8C5=4 Last Remaining/L1
Cross-hatching reveals 4 can only go in one cell in Box 8
78. R7C5=1 Template/L6
Template: digit 1 always at R7C5 in all 1 valid patterns
79. R8C6=5 Last Remaining/L1
Cross-hatching reveals 5 can only go in one cell in Box 8
80. R9C6=7 Last Remaining/L1
Cross-hatching reveals 7 can only go in one cell in Box 8
81. R9C8=3 Full House/L1
R9 has 8 cells filled — only one empty cell remains!
82. R7C6=9 Full House/L1
C6 has 8 cells filled — only one empty cell remains!
83. R7C9=7 Full House/L1
R7 has 8 cells filled — only one empty cell remains!
84. R8C8=8 Full House/L1
C8 has 8 cells filled — only one empty cell remains!
85. R8C9=1 Template/L6
Template: digit 1 always at R8C9 in all 1 valid patterns
Saturday 28-Feb-2026
... by: Tomas
Standard methods to 26.D3=1 leads to contradiction, thus E3=1.
Solved with standard methods.
Saturday 28-Feb-2026
... by: Dieter
#687 - initially populated cells: 25 = 30,9 %No solver used, solver = brain.
basics: B8=5; E5=6
populated cells: 27 = 33,3 %
Strategy: numbers 2,5,1,6,8,9 occur most frequently, combine two cells.
combinations of J1 = (3,4,5,6) and J8 = (3,6,7)
J1/J8 = 4/3 solves.
Saturday 28-Feb-2026
... by: Yves
A3=4 & C4=1Two one-cell solution
Saturday 28-Feb-2026
... by: Serban
# 687 B8=5 E5=6 Basics 271. C4=1 solve
2. A3=4 OR J1=4 OR C9=4 solve
3. B1=9 OR C5=G6=9 solve