Author: Tom Kerrigan
Date: 05:03:46 05/25/03
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On May 25, 2003 at 07:53:59, JW de Kort wrote: >Hi friends, > >My chess engine currently has two search related problems. > >1) Sometime a e.g. 8 ply search only returns a pv a say 4 or 5 or sometimes even >only one move. Can this be a result of using the hashtable? The obvious possibility is that there was contention for the hash table entry that would have contained the rest of your PV. There may be additional explanations too. >2) The engine searches until a certain amount of time is spend. If the search >notices that the time has ran out, the search is stopped an beta is returned. I >think this is the correct thing to do. BUT the following happens: sometimes a 8 >or 9 ply search is done and a correct move (at least a correct move in the eye >of my engine) is found but then suddenly a completely different move is >selected, most of the cases this is a blunder and often the evaluation drops >with about the score of a bishop because a bishop is lost. It is nice to have >written a enging playing like a human, but i would rather remove this problem. When time runs out, my program just stops searching and doesn't try to do anything clever that might be wrong. After every call to search, I check stop_search, and if it's TRUE, I return 0... -Tom
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