Author: David Rasmussen
Date: 09:47:29 01/11/02
Go up one level in this thread
On January 11, 2002 at 12:40:03, Matthias Gemuh wrote: >On January 11, 2002 at 11:44:39, David Rasmussen wrote: > >>[D]2Q2n2/2R4p/1p1qpp1k/8/3P3P/3B2P1/5PK1/r7 w - - 0 1 >> >>In the above position, my search tree explodes because of extensions. It takes > >>3 minutes and 42 million nodes to finish an 8 ply search. How does your program >>do? >> >>Any good ideas on how to limit extensions in such a position. >> >>P.S. Solving the position is no problem. It is a simple mate in 5 plies, and is >>found very early on at depth 1 or 2 or so. Still, there must be something >>unsound about my extensions, or at least room for improvement, when this >>position makes the tree explode. >> >>/David > > > > >My HyLogicChess has the following stats: >All extensions active. >Quiescence moves: 29% (no explosion, my average is normally have 40%) >Total moves searched: 11000 >Speed; 84 kN/s >Move Ordering: 78% (normally 90%..92%) >[1] (0.18) 1.f3 (00h:00m:00s) >[2] (0.12) 1.Qb7 e5 (00h:00m:00s) >[3] (14.50) 1.Qxf8 Kh5 2.Rxh7 Kg4 3.Qxd6 (00h:00m:00s) >[4] (+Mate in 3) 1.Qxf8 Kh5 2.Rxh7 Kg4 3.f3 (00h:00m:00s) My program performs similarly if only searching to ply 4, but try letting it search to ply 9, even though it has already found the mate. That is what I am talking about. /David
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