Author: Uri Blass
Date: 10:13:13 12/01/05
Go up one level in this thread
On December 01, 2005 at 13:06:14, Uri Blass wrote: >On December 01, 2005 at 12:46:53, Tord Romstad wrote: > >>On December 01, 2005 at 10:42:00, Steve Maughan wrote: >> >>>Centrino 2 GHz >>> >>>[D]3n3k/bp3pp1/8/8/R1Q2R2/6p1/B2p1PP1/q1rn2K1 w - - >>> >>>Engine: Glaurung Mainz (128 MB) >>>by Tord Romstad >>> >>>10/45 0:11 0.00 1.Rh4+ Kg8 2.Rh8+ Kxh8 3.Qh4+ Kg8 >>> 4.Qxd8+ Kh7 5.Rh4+ Kg6 6.Qd6+ Qf6 >>> 7.Qxg3+ Qg5 8.Qd6+ Qf6 9.Qg3+ Qg5 (4.858.674) 431 >>> >>>11/47 0:21 +M19 1.Rh4+ Kg8 2.Rh8+ Kxh8 3.Qh4+ Kg8 >>> 4.Qxd8+ Kh7 5.Rh4+ Kg6 6.Qd3+ f5 >>> 7.Qxg3+ Kf6 8.Qd6+ Kg5 9.Rh5+ Kxh5 >>> 10.Bf7+ Kg5 11.Qg3+ Kf6 12.Qg6+ Ke5 >>> 13.Qe6+ Kf4 14.g3+ (9.646.864) 453 >> >>Hi Steve, >> >>The PV is incomplete, which makes me a bit worried. Glaurung should never >>announce >>mate unless the PV ends in a mate. Do you use a GUI or some other tool which >>truncate >>the PVs? Otherwise, I have a new bug to track down. :-( >> >>The current development version of Glaurung is much faster in this position, by >>the way. >>On my iMac G5 (which is about half as fast as your Centrino), it announces mate >>in 21 >>after 6 seconds and 8 plies, and reduces this to mate in 19 at the next >>iteration after 11 >>seconds. The reason for the improved solution time is simple: I am >>experimenting with >>unlimited checks in the qsearch (Glaurung Mainz searches checks only in the >>first 3 plies >>of the qsearch). >> >>Tord > >unlimited checks in the qsearch cannot work. >You may not have a limit of plies but with no limit the search is going to >explode. > >Uri I can add that even if you allow only one check at every ply in the qsearch you may have check 3 replies,check 3 replies,.... This means that if you have 20 consecutive checks you may need to search 3^20 positions to finish your qsearch. Of course you can limit number of nodes in the qsearch but qsearch with no limits does not make sense to me.
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