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Tuesday 15-Jan-2019

... by: RocusHalbasch

Marion Barbee

I ran the AI Sudoku Top 10 you use with your solver on it, and got the following:
Solved AI Sudoku Top 10 boards 2000 times in 10.586 seconds.
For an average solve time of 5.293 ms for all 10.
For an average solve time per puzzle of 0.5293 ms each.

They really aren't that tuff, the Weekly Unsolvable here took way more time.

For a tough one following is a nine clue puzzle that follows all the rules for Windoku, Color Sudoku, and Sudoku X:

000 080 700 ---- 136 285 794
000 000 305 ---- 842 197 365
000 000 002 ---- 759 634 182

000 009 001 ---- 678 349 521
000 000 000 ---- 514 728 639
003 000 000 ---- 923 516 478

000 000 000 ---- 467 952 813
000 000 000 ---- 281 473 956
000 060 000 ---- 395 861 247

Attempting 9 clue puzzle:
ClueStatus: VALID AnswerStatus: SOLVED
....8.7........3.5........2.....9..1...........3............................6....
1362.5.94842197.6.75963418.67834.52.51472863992.5164784679528132814739563958.1247

Solved 2000 times in 4.8 seconds.
For an average solve time of 2.4 ms.

Monday 14-Jan-2019

... by: Marion Barbee

Thank you RocusHalbasch! Iwill definitely check it out.

Saturday 12-Jan-2019

... by: RocusHalbasch

Marion Barbee

I donít know if you saw my last post in last weeks unsolvable. But I put my sudoku library up on github. The last post had some more details about it as well.

Saturday 12-Jan-2019

... by: Marion Barbee

147 652 839
863 194 572
952 378 164

286 539 741
734 261 985
591 847 326

478 925 613
329 716 458
615 483 297

puzzle type=manual input
Elapsed time is: 15 milliseconds
guesscount=39
glist[1].r=8
glist[1].c=3
glist[1].v=9
glist[1].zcnt=57
=======================================================
glist[2].r=1
glist[2].c=7
glist[2].v=8
glist[2].zcnt=56
=======================================================
glist[3].r=6
glist[3].c=6
glist[3].v=7
glist[3].zcnt=52
=======================================================
glist[4].r=1
glist[4].c=4
glist[4].v=6
glist[4].zcnt=51
=======================================================
glist[5].r=1
glist[5].c=3
glist[5].v=7
glist[5].zcnt=50
=======================================================
glist[6].r=6
glist[6].c=8
glist[6].v=2
glist[6].zcnt=48
=======================================================
glist[7].r=8
glist[7].c=6
glist[7].v=6
glist[7].zcnt=47
=======================================================
Solution order =
H39,
A78,
A99,
A83,
A24,
F67,
A46,
A37,
E17,
F82,
H66,
E56,
E79,
D69,
E42,
G65,
C68,
E95,
E88,
G93,
D45,
F73,
E23,
F54,
H13,
F31,
F15,
I35,
C19,
D36,
B59,
D28,
B18,
G38,
I58,
I16,
C32,
B92,
B26,
G52,
G14,
D84,
C94,
B87,
D77,
G81,
B41,
C57,
C71,
D91,
H51,
I21,
H47,
H22,
I44,
I72,
H74,

Saturday 12-Jan-2019

... by: numpl_npm

By Andrew's Solver with Basics, POM and ALS,

-13DE2 ( +68DE2 ) => contradiction
So +1D2 or +3E2.

+1D2 => contradiction
So +3E2.

+12HJ7, +13HJ7, +14HJ7, +23HJ7, +34HJ7 => all contradiction
So +24HJ7.

-1B4 => contradiction
So +1B4.

Then to the solution.

Saturday 12-Jan-2019

... by: Frans Goosens

With trial and error

Combination A2=468 and I7=124

************************************************************
A2=4 I7=1 No solution, Fixed

Combination 2-digits cells

A4=6 No solution, Undo calculation
A4=7 Wrong, Undo calculation
A4=6 No solution, Fixed
A9=3 Wrong, Undo calculation
A9=9 Wrong, Undo calculation

All reset to initial position

************************************************************
A2=4 I7=2 No solution, Fixed

Combination 2-digits cells

A4=6 No solution, Undo calculation
A4=7 No solution, Undo calculation
A9=3 No solution, Undo calculation
A9=9 ( B9=2 ) Solved,


#330--------------------------Solution
100 052 000-------------147 652 839
003 004 500-------------863 194 572
050 300 060-------------952 378 164

200 030 000-------------286 539 741
004 001 000-------------734 261 985
090 800 006-------------591 847 326

070 900 600-------------478 925 613
000 000 008-------------329 716 458
000 003 097-------------615 483 297

Total solving time is : 95 sec.
Number of steps is : 10747

Saturday 12-Jan-2019

... by: Frans Goosens

With trial and error

Combination A2=468 and I7=124

************************************************************
A2=4 I7=1 No solution, Fixed

Combination 2-digits cells

A4=6 No solution, Undo calculation
A4=7 Wrong, Undo calculation
A4=6 No solution, Fixed
A9=3 Wrong, Undo calculation
A9=9 Wrong, Undo calculation

All reset to initial position

************************************************************
A2=4 I7=2 No solution, Fixed

Combination 2-digits cells

A4=6 No solution, Undo calculation
A4=7 No solution, Undo calculation
A9=3 No solution, Undo calculation
A9=9 ( B9=2 ) Solved,


#330--------------------------Solution
100 052 000-------------147 652 839
003 004 500-------------863 194 572
050 300 060-------------952 378 164

200 030 000-------------286 539 741
004 001 000-------------734 261 985
090 800 006-------------591 847 326

070 900 600-------------478 925 613
000 000 008-------------329 716 458
000 003 097-------------615 483 297

Total solving time is : 95 sec.
Number of steps is : 10747

Saturday 12-Jan-2019

... by: Algo

Cell Val Remark
-----------------
A3 7 guessX3
B2 6 guessX3
D4 5 guessX3

1.5m

Saturday 12-Jan-2019

... by: RocusHalbasch

Attempting the Weekly Unsolvable #330 form SudokuWiki.org:
ClueStatus: VALID AnswerStatus: SOLVED
1...52.....3..45...5.3...6.2...3......4..1....9.8....6.7.9..6..........8.....3.97
.476..83986.19..729.2.781.4.865.974173.26.9855.1.4732.4.8.25.1332971645.61548.2..

Solved 2000 time in 3.679 seconds.
For an avereage solve time of 1.8395 ms.

Saturday 12-Jan-2019

... by: BobW

Total solution time: 471.68 milliseconds

Minimal backdoor: B2=6 J7=2

147 652 839
863 194 572
952 378 164

286 539 741
734 261 985
591 847 326

478 925 613
329 716 458
615 483 297

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.
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