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Sudokuclean
I had a bet running with a friend many years ago. She showed me the first sudoku i saw. After a few minutes, i said, it is not so difficulty to write a program to solve that riddles. Because she did not believe me, we bet for a box of beer if i can do this in 2 weeks or not. A few hours later, i was a box of beer richer :)
Not sure, when this exaclty was. Somewhen between 2000 and 2007.
For everyone, interrested, in how i did this, here is my (not beautiful) code. I cleaned up a little bit, get smarty with composer now because i can. I also changed method of the form to GET and added a flag ?API=1 to give back json. This should enable usage from any other program :)
You can test it here: https://sudokuclean.digital-infinity.de/
Have Fun, reading.