Commit 592de110d15c55512f8254b38051e3a61853eb82 looks weird. I don't have the time to read the code, but mod 9 instead of mod 8 in a chess-related program look

Commit 592de110d15c55512f8254b38051e3a61853eb82 looks weird. I don't have the time to read the code, but mod 9 instead of mod 8 in a chess-related program looks like the off-by-one has just been "fixed" in the wrong place.