>  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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