#36 Invalid sudokus

[Antonio Cordero Balcazar]

Sometimes the generated sudoku is unsolvable. If you select "solve/check progress" at the start is says if has one solution, but after some completion you see that it's not true and if you repeat the check it says "no solution". If you try the program to solve it, it can't.

[Emil Andersson]

Could you please attach a saved sudoku file where this is the case?

[Nobody/Anonymous]

I suspect that when this happens the "some completion" has introduced an erroneously entered box. In other words, you have made a mistake and the board is no longer solveable, not a problem in the program.

[Antonio Cordero Balcazar]

If that was the case, then selecting the "solve intelligently" or "solve by force" options would overwrite my failed attempt, but it doesn't (it also says its impossible). Also, previous versions offered the option to go back to the moment i made a mistake. This one doesn't.

I haven't yet got a saved sudoku to send (not playing much lately).