Strategies for Number Puzzles of all kinds
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Sunday 10-Dec-2017

... by: jkl

Hi ghfick
MIT open source line 120:
...4...8...7..92......3...526...1.....19.....7.....1..5......4...6..29..9..8....3;11.70;1.20;1.20;elev;20;64;22;

Saturday 9-Dec-2017

... by: ray

Use basic strategies and the forcing bi-location cell set method.Start with
B6{278} - bi-location and tri-location for 2.Progressively form the 3-element
bi-location cell set B6E1G4,forcing only the run out values for the 1-cell to 3-cells values until B6E1G4 = (7,7,5) which gives the solution.Other bi-location cell set solutions found were: CE1G4 = (8,7,5), A3E1 G4 = (7,7,5).
Using this solution,the following non bi-location cell set was found: A5E1F5
= (4,7,3).
Using basic to extreme strategies, E1 = 7, A5 = 4 gave 1-cell solutions.

Saturday 9-Dec-2017

... by: ghfick

Hi jkl,
Could you assist me to find the puzzle in eleven's list? I am unsure of the designation given as 20;64;22. Eleven lists puzzles by their SE rating.

Saturday 9-Dec-2017

... by: jkl

morph of eleven;20;64;22

Saturday 9-Dec-2017

... by: Neil

Ariadne's Thread finds A5=4.

Saturday 9-Dec-2017

... by: JC Van Hay

Identical to U268

Corrected Saturday morning
Sorry! I have been inserting new puzzles manually into the database table. It's a bit to easy to make a mistake with the indexes and various fields and so an old one was being selected rather than the correct one.
Andrew Stuart

Saturday 9-Dec-2017

... by: Paolo Calaresu

This sudoku has 11”backdoor” that directly solves the puzzle with the basic technique but does not demonstrate the uniqueness of the solution: B6=9,D4=9,D6=3,D7=2,E8=7,E5=2,F1=3,G3=2,G5=8,H4=2 and J5=7.
To demonstrate the uniqueness of the solution:
L'un des 11 "backdoors" + G8 = 9 => solution unique.

Saturday 9-Dec-2017

... by: ray

Corrections: D7 = 2, E8 = 8

Saturday 9-Dec-2017

... by: ray

Use basic strategies and the forcing bi-location/bi-value set method.Start
withD4{29} - bi-location/bi-value for 2 and 9,tri-location for 9.Forcing the
1-element bi-location set D4 = 9 gives the solution.Other bi-location 1-cell
solutions found were: B6 = 9, E5 = 2, F6 = &H4 = 2, G5 = 8. Non bi-location
1-cell solutions found were: d7 = 2,e* = 7, F1 = 3, G3 = 3, J5 = 7.

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