Yet another week to break the record. This time we solved Sudokus with box dimensions of 75 (5625×5625 grid) and 80 (6400×6400 grid). Each puzzle took 6-7 days to solve.
Observers might note that the expected trend to solve the Sudokus seems to have changed. I reduced computational times by breaking the problem into sub tasks which take less computer memory. Percentage wise the difference isn’t that much. However, what was a 10 days ETA took only 6 days for the 5625×5625 grid. The even larger 6400×6400 grid took 6.8 days instead of 2 weeks. While it would be nice if the solver were faster, it is resolving around 30 blanks per second – way faster than a human could do.
To put it in perspective, a human capable of resolving one blank per second (which would be ridiculously fast) would take 176 days to solve the 5625×5625 grid. The larger grid (6400×6400) would take the same human 228 days. Both these puzzles are 3 orders of magnitude larger that the Guinness Book of World Records multi-puzzle Sudoku which has about 17,920 blanks. Check out the Puzzle Archive for the puzzles and the step by step solutions.
Time marches on. The computer is now working on the box dimension 85 puzzle (7225×7225 grid).