HellChess by HellHound SG :
multiplatform (intel windows/linux, Amiga, Palm, PocketPC, GBA) !
huge AI engine which will make your singleplayer experience quite challenging !
lots of tutorials to make you better at chess every time !
every setting of the game is configurable through the userfriendly interface !
play online with your friends or total strangers via Direct Connect or the HellHound Masterserver !
More details :
Alpha-Beta search with HC™ tweaks
Pruning
Killer heuristics
Quicksort move generator
Iterative deepening
Parallel processing possible
Built on Braatworst™ technology