stockfish国象的代码，，注释很好。功能很强。-Stockfish is a free UCI chess engine derived from Glaurung 2.1. It is not a complete chess program, but requires some UCI compatible GUI (like XBoard with PolyGlot, eboard, Jose, Arena, Sigma Chess, Shredder, Chess

著名国际象棋软件引擎xboard源程序，棋力不错-Xboard source of the famous chess software engine, good playing strength