It's from sudoku.coach, so maybe it's because it has to follow strict techniques but humans don't have to?
btw the grid that it says chains are necessary at 012547080035180742487000050059008060008060500006305810061800405803654090594000608, and it gets r5c2=4 after those three steps
An LMI player
Subject: Re: Standard & Neighbours - 31st Jan - 6th Feb 2026 - Sudoku Mahabharat & ISC Qualifier 2026 @ 2026-02-06 11:21 AM (#38117 - in reply to #37942) (#38117)
Subject: Re: Standard & Neighbours - 31st Jan - 6th Feb 2026 - Sudoku Mahabharat & ISC Qualifier 2026 @ 2026-02-07 8:36 AM (#38140 - in reply to #38094) (#38140)
It's from sudoku.coach, so maybe it's because it has to follow strict techniques but humans don't have to?
btw the grid that it says chains are necessary at 012547080035180742487000050059008060008060500006305810061800405803654090594000608, and it gets r5c2=4 after those three steps