Author: Jeremiah Penery
Date: 17:38:08 03/15/02
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On March 15, 2002 at 19:27:32, Slater Wold wrote: >On March 15, 2002 at 17:59:26, Kim Roper Jensen wrote: > >>Hi >> >>Just wanted to share a position from a game I played some years ago. >> >>It's a position where its hard to see which side, have the best protected king. >> >>[D] 2r1k1nr/4ppbp/3p2p1/p3P3/bp1B1PP1/7P/qPPQ2B1/1NKR3R w - - 0 1 >> >>How long does it take to see that white have the better position ?? >> >>Best move here is 1.exd6! > > 10 18.98 ++ 1. exd6!! > 10-> 49.07 -1.27 1. exd6 Bxd4 2. d7+ Bxd7 3. Qxd4 Nf6 > 4. g5 Ba4 5. Be4 Rc4 6. Qd8# <HT> > 11 2:01 ++ 1. exd6!! > time=3:00 cpu=208% mat=-1 n=245840938 fh=93% nps=1364k > ext-> chk=17801393 cap=870361 pp=502965 1rep=1877028 mate=95160 sing=16 >From my (very unstable) Crafty. As you can see, it's using singular extensions. I tried a version of Crafty with singular extensions recently, and I always wondered about the number given in the search statistics for singular extensions done. The extensions incur a very large overhead in the search (1-2 plies of depth at least are lost), and yet only 16 nodes in the search are extended?! I would bet there are more than 16 singular nodes out of 245 million nodes - is the number reported just wrong, or is that all the extension it's doing? Jeremiah
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