Does anyone has articles/links/data about MTDF and AlphaBeta algorithms? I would love to receive any related material. tx. One question that I failed to answer is this: AlphaBeta algorithm (using a hash) returns a value, but not the best move. What is the best move? If AlphaBeta fails high, than I guess the best move is the one that caused the beta cut off, but if it fails low? The move that had received the returned score is not nessecery the best one (the result score is a maximum score, and the real score could be much lower than this). So what is the best move found on a certain AlphaBeta call? Thanks Dudu P.s. You can doanload my chess program at : ftp://duduarbel.mine.nu/chess.exe Now I'm working to convert it to an UCI engine.