Advances in Computer Chess - download pdf or read online

By M. Clarke

ISBN-10: 0080268986

ISBN-13: 9780080268989

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Pawn Evaluation Each cycle examines a file for pawn formations. H. Condon and K. Thompson are examined on the file in question and on the file to each side. Separate evaluations are obtained for passed pawns, isolated pawns, backward pawns and doubled pawns. These values are summed and accumulated over the eight files. Ray Evaluation On every square, there is a finite state machine. Its input is a ray state, the piece occupying the square, a bit from the pawn evaluator indicating that this square is behind enemy lines, a bit from the pawn evaluator indicating that this square is a piece outpost, and a bit from the king location ROM that this square is near the enemy king.

The same applies to moves causing cutoffs at MIN nodes. Values A and B corresponding to alpha and beta in an alpha-beta search can be used to further prune the tree storage. The values of A and B at the root node PO are initialised to -°° and +°°. On descending to a node P+ from a parent node P, A(P+) is initialised to A(P) and B(P+) is initialised to B(P). A is updated at MAX nodes and B at min nodes by: (i) (ii) If P is a MAX node and P+ a successor of P then in backing up from P+ to P: A <- max{A(P),BVL(P+)} If P is a MIN node and P+ a successor of P, then in backing up P+ to p: B <- min{B(P),BVH(P+)} On subsequent searches from PO, A and B are not reset to -°° and +°° but keep their current values.

After the eight cycles, every ray on the chess board has been examined and accumulated. The accumulated slow evaluation is added to the fast evaluation and made available to the micro-code. A condition code indicating that the slow eval­ uator is busy is available to the micro-code. Thus the micro-code can wait for the full static evaluation (fast plus slow) to become stable. TRANSPOSITION TABLE The transposition table is an associative memory addressed by current board position. It is used as a cache of recently evaluated positions.

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Advances in Computer Chess by M. Clarke


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