Author: milix
Date: 11:22:28 01/23/04
I tried to implement the long checks idea of Ed Schröder (http://members.home.nl/matador/chess840.htm#QS) but not worked for me. Maybe my QS is not implemented correctly to have this checks concept but I can't figure it by myself. I wish for some help here (maybe from Ed himself) :-) In my main search, before I enter the QS I set the variable MAX_CHECKS_DEPTH to 2. My quiescent in pseudo code: quiescent(alpha, beta) { save the MAX_CHECKS_DEPTH score = full_evaluate() if (score < alpha) return score if (score > alpha) alpha = score if (side_to_move_is_in_check) generate_legal_moves() else if (MAX_CHECKS_DEPTH > 0) generate_good_equal_captures_queenpromotions_and_checks() else generate_good_equal_captures_queenpromotions() sort_the_moves() for each move in the list { make_the_move() score = - quiescent(-beta, -alpha) undo_the_move() restore MAX_CHECKS_DEPTH if (score < alpha) return score; if (score > alpha) alpha = score; } MAX_CHECKS_DEPTH = MAX_CHECKS_DEPTH - 1 return alpha } Thanks in advance!
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