Author: Ross Boyd
Date: 00:50:21 08/20/04
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On August 20, 2004 at 01:55:19, Daniel Shawul wrote: > >i used to work my chess on a 1.8GHZ PC. >On that PC DanChess(slower program) can score good point >against some fast programs with high NPS. But now when i >changed to a 2.8GHZ PC things are different. my prog has >really a very hard time against those engines. My question is >both programs are speeded up by the same amount,so why the difference? how much >are the other programs benefited? usually i test at 40 moves in >3 minutes.what is the equivalent of this on a 2.8ghz pc. My guess is too many extensions. Extensions are effective on slower PCs but can cause tree explosions which then limit the overall search depth. You could try applying certain extensions (eg. recaptures, pawnpushes to 7th, simplification into pieceless endgames) only when remaining depth <= 3 ply - or something like that. Next guess is to improve move ordering and quiescence pruning. Write a SEE routine if you haven't already and use it to prune losing captures in the qsearch. All these things drastically reduce the size of the tree... Hope this helps, Ross
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