Author: Slater Wold
Date: 22:15:49 03/15/02
Go up one level in this thread
On March 15, 2002 at 20:38:08, Jeremiah Penery wrote: >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 Look at http://www.talkchess.com/forums/1/message.html?218098.
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