A sudoku game on my computer wouldn't recognise that I'd solved the puzzle - I'd complete it and the time would keep on counting. This happened three times in a row (easy mode). I then looked up this thread to see if multiple solutions existed to see if this was the problem.

I tried again, this time trying not to "think like I normally do" and employed different techniques before others and sure enough - I got a solution that the computer finally accepted. Out of interest, it seems that chess-playing computer programs SEEM difficult to most humans, beating the world's number one player etc, but if you start "thinking like the computer" even amateur players can consistently beat that same program.

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The Sudoku puzzles are designed in such a way that you should never need to guess at any stage. If I am tempted to guess, it is because my logic is failing me, and I use some "suppose it is this" hypothetical cases to try to find a contradiction quickly and move on.

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Thanks for pointing that out- I hope that wasn't sarcasm on your part?

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