http://bugs.winehq.org/show_bug.cgi?id=8634
--- Comment #8 from Gareth tgheretford@fast4.net 2008-05-03 16:19:20 --- Turing on Pixel Shaders on Winecfg fixed the problem with the dark squares but then the game jerks very badly to become unplayable (which is another bug in itself, more specificially #8642).