Very well, now that the site publishes only those sudokus that have a logical solution. Thank you! And does program the device, based on the uniqueness of the solution?
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Nothing of the sort! The site contains the same Sudoku that was before, just when you transfer them to a new platform they were regrouped according to other criteria. And decided became much less it was once difficult Sudoku was solved 150-250 times, and now 50-70 times. Something like that...