Sunfish can’t handle end games, like KRK.

[ChristerNilsson]

I was impressed by the strong opening and middle game, but not so much by the end game. I guess PST for endgames is needed and some interpolation. KRK is considered easy, but I failed solving this by myself. Maybe mobility could also be helpful.

[thomasahle]

This is true. I wonder if Micro-Max (https://www.chessprogramming.org/Micro-Max) can solve KRK?