Author: Mridul Muralidharan
Date: 17:07:23 12/29/03
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On December 29, 2003 at 18:16:39, Tord Romstad wrote: >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 Ah ha ! One of the first ches playing versions of emss had the very same bug :) So I have company ;) Mridul
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