Author: Andrew Platt
Date: 08:25:16 09/09/04
Go up one level in this thread
On September 09, 2004 at 10:03:03, Chris Welty wrote: >On September 09, 2004 at 09:45:08, Andrew Platt wrote: > >>4r1k1/p1qr1p2/2pb1Bp1/1p5p/3P1n1R/1B3P2/PP3PK1/2Q4R w - - >> >>You may recognize this as WAC 141 (again!). The key move is Qxf4! which I spot >>at iterate ply 9, though I don't see the mate there because the search drops >>into the quiescent search where I don't see the final move Rh8# (I don't >>generate / deal with checks in qsearch). >> >>So we back up non-mate scores which, as expected, end up in the hash table - >>including the following: >> >>Qxf4 Be5 Rxh5 Bxf4 (ply 4, depth 270) > >If this position was searched with remaining depth>0 it should be in your >hashtable as mate in 1. If it was searched with remaining depth=0 it should be >too shallow to impact your null-move search. Hmm, you're right: Qxf4 Be5? Rxh5 Bxf4?? Rh8# I'll have to check how we're backing up a non-mate score there. Andy.
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