Ohhh daemons!!! i forgot to use the perlmonks' supersearch before submitting my modest sudoku-perl generator :'( ...
Solve Sudokus are a trendy vice! thanks for the link to the SadMan Sudoku, it has a list of interesting ''techniques''

I can bet that in future there were more sudoku-perl on the perlmonks code-pool :-) ...

Best regards