Author: Dann Corbit
Date: 15:23:21 01/08/01
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On January 08, 2001 at 17:30:55, Scott Gasch wrote: >Hi all, > >I've been running my engine vs. the ECM 879 position test suite recently and >trying to improve its score. Currently it gets about 500/879 correct at 20 sec >per move. > >I was reading in Ernst's papers about extended futility pruning and noticed that >he includes DarkThought's results on the ECM to 8, 10 and 12 ply. His engine >DarkThought scores more positions correct on the ECM even when searching to a >fixed depth of 8 ply than my engine does searching 20 sec / move! My engine is >getting 9-10 ply deep in most of these positions at a 20 sec time control and >would have expected better results. > >This leads me to believe DarkThought must have some smart extensions in search. >I currently do check, nullmove threat and pawn push extension. I am thinking >about a recapture but do not know how to perserve a small tree size with this >extension turned on... I see Bob's method for limiting recapture extensions and >the method used by the author of AMY... does anyone have other ideas on how to >keep tree size in check with recapture extensions? > >Second, does anyone have any other intelligent extensions to discuss? Is my >program's poor tactical performance on the ECM test suite a function of the lack >of recapture extension or it there some other extension missing? I hope that you are using one of the trimmed and updated versions of the ECM. The ECM is probably the buggiest test suite of all time. A bad result might really be better than a good one, if you are using the original!
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