http://bugs.winehq.org/show_bug.cgi?id=58662
--- Comment #9 from Zowie zowie+wine@vandillen.io --- (In reply to Stian Low from comment #7) Your guess was right after all — Moyo Go uses a 24-bit PFD_DRAW_TO_BITMAP pbuffer to draw each of the stones. As it turns out 24-bit bitmaps are also broken in much the same ways as 16-bit ones, but the fix is pretty simple. I'll make a merge request for the fix later today.