The New Sudoku Players' Forum

[enxio27]

Ninja Pack 2 Puzzle 4:

Richard Broughton's SudokuSolver couldn't solve this, even with all techniques enabled except brute force. I don't have access to another solver that will handle these. Do I simply need to re-order the techniques, or is it really unsolvable?

http://i.imgur.com/JicQG6A.png

Code: Select all

480000000900600200001092000304060900000930070010500000000007000000300000000040000
460000000032090000000000000500100970007008030000000080000002000000700000000056000
000009003000000040000000009200000001000460900008030000000380000000900000000010000
900030000000010000000650000070800603020070000030002095702900000008540000006000000
000080000000001000000000000000050000000028000590604200000500000000000000000000000
000023007000000304000070001030604100900000000740050000000000900000000030000302605
000209000000400000000000000010500000009000860000007304670030000000000000200000000
000700000000000000000200000007010008000009206003000051000004080000600000000000000
000050000000104000000070000000040000000002570050003204147000080860020100003000000


[creint]

Yes this one is solvable with only one solution.
Solved with logic, 2 passes with forcing nets (without sets) with all exclusions.
Around 280 seconds with max net depth of 85 and 64 in the second pass.
Still need to remake that part so that it will be much faster.
I don't have anything else between locked sets and nets for now. It could be only needing some short chains/fishes.

[enxio27]

I finally enabled everything (including Bowman's Bingo), and SudokuSolver was able to solve it, although it took quite a while (at least 15 minutes). Definitely not a puzzle I want to tackle using pencil and paper. Unfortunately, on the vfalcone.ru Web site, you have to enter a correct solution in order to get the next puzzle.