Author: Tord Romstad
Date: 15:16:39 12/29/03
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On December 29, 2003 at 16:01:08, Andrew Williams wrote: >I make sure that I have a legal move available before pruning stuff. This is good advice, and reminds me of an amusing bug I had in early versions of Gothmog (while I was still using normal futility pruning): In positions which were so bad that all moves were pruned because they had no chance of bringing the score anywhere close, to alpha, the engine thought: "I have no moves, but I'm not in check -- It's stalemate. Let's return 0". As a result, the engine would sometimes make horrible blunders, and print out PVs where it sacrificed almost all its pieces, with a draw score at the end of the line. Tord
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