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> If trial-and-error was acceptable in a sudoku, then you could just as
> well give an empty sudoku grid for someone to solve.
I was assuming (as do most others I think) that sudoku problems only have 1
unique solution. What would be the point of an empty grid?
> The principle in sudoku puzzles is that they can be solved without having
> to guess anything. The chain of required deductions may go very deep in
> the hardest sudokus, but it's always possible to solve it without having
> to guess.
However most people would rather use trial and error than go very deep in
logical deductions. ie write a 3 in lightly and fill in a few more squares
based on that, oops no that doesn't work, original square must have been a 6
then. Isn't trial and error a form of deduction anyway?
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