Poster #3 moved the 8 in the lower right hand corner. So that solution is not correct. My results agree with poster #1.On the other alleged world's hardest Sudoku AI Escargot, my solution is162857493534129678789643521 475312986913586742628794135 356478219241935867897261354These were challenging but did not even take a day much less 3 months, unless that was the time Arto Inkala spent to develop them Abusive comment hidden. (Show it anyway.)
On the other alleged world's hardest Sudoku AI Escargot, my solution is
162857493
534129678
789643521
475312986
913586742
628794135
356478219
241935867
897261354
These were challenging but did not even take a day much less 3 months, unless that was the time Arto Inkala spent to develop them