eleven wrote:Strange question.
If you choose the correct one of the 2 digits, and made no mistake before, and the puzzle has only one solution, it will be solved with easy singles.
Personally i consider a puzzle to be solved, when the last number is solved (i.e. you have the complete solution).
I may not have made myself clear. I was trying to find out if one is left with a few boxes, each of which have only two possible correct answers (and all other boxes have been correctly filled with a single number,) then it doesn't matter which of the two possible numbers you pick from one of those remaining boxes as once chosen, then all other remaining boxes will be filled in correctly. This has been my experience as I often wind up this situation and I find that the puzzle will be solved by choosing one number and then going one tot he rest. But now as I think about Sudoku having only one solution, this observation appears to say that Sudoku may have two possible solutions. Of course, it could be that I'm not really paying enough attention to the "solved" puzzle. therefore, next time this situation arises, I will submit photos of just what I saying.