Author: Andrew Platt
Date: 10:42:44 09/01/04
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On September 01, 2004 at 00:51:47, Stuart Cracraft wrote: >I know this is a long shot throwing this out there without much more >info, but perhaps I'll get lucky and someone has seen this before. >It's appeared on this bulletin board about 6 years ago. > >[D]4r1k1/p1qr1p2/2pb1Bp1/1p5p/3P1n1R/1B3P2/PP3PK1/2Q4R w - - bm Qxf4; id >"WAC.141"; > >This position is supposed to be a good test for the implementation >of Moreland's mate threat extension (if null move search value returns a mate, >extend, or if it returns a mate one move away, extend (the more limited version) This is a hard one for my engine, Schola, too but the mate extension hurts it significantly. I'm not sure I've got my implementation right here either! In both cases it takes a 13 ply search to find this (11 ply if I disable null move). Without the extension it takes 546,541,836 nodes and 16.10 minutes to find the mate; without it it takes 812,152,834 nodes and 26.44 minutes! I'm going to try checks at the first level of qsearch too and see if that helps. Last time I tried checks in qsearch it broke too many other tests though. Andy.
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