Author: Uri Blass
Date: 02:11:18 11/26/02
Go up one level in this thread
On November 26, 2002 at 04:43:16, David Rasmussen wrote: >[D]r4rk1/1p1n1pp1/1bq1bn1p/p1pp4/2P2B2/1NNP2P1/PPQ2PBP/R4RK1 w - - 0 19 > >Chezzz encountered this position in a game. This position, and some immediately >before and after it, made Chezzz go nuts in quiescence search: > >time nodes depth score pv >00:00:00.14 52kn 02/02/16 --------------------------------------------------- >00:00:00.14 53kn 03/03/08 +0.055 19. Nb5 a4 20. Nd2 >00:00:00.17 66kn 03/03/12 +0.100 19. Rae1 Rae8 20. Nb5 >00:00:00.25 88kn 03/04/14 --------------------------------------------------- >00:00:01.37 631kn 04/04/16 +0.205 19. Rae1 a4 20. cxd5 Nxd5 > 21. Nxd5 Bxd5 >00:00:01.78 804kn 04/04/16 --------------------------------------------------- >00:00:02.08 953kn 05/06/16 +0.205 19. Rae1 a4 20. cxd5 Nxd5 > 21. Nxd5 Bxd5 >00:00:02.59 1191kn 05/06/16 +0.277 19. Rfe1 a4 20. Nd2 Rfe8 > 21. cxd5 Nxd5 22. Bxd5 Bxd5 > 23. Rxe8+ Rxe8 24. Qxa4 Qxa4 > 25. Nxa4 >00:00:04.14 2020kn 05/06/18 +0.410 19. Qd2 Rfe8 20. Rae1 Red8 > 21. Qe3 >00:00:04.20 2040kn 05/06/18 --------------------------------------------------- >00:00:06.00 3083kn 06/08/18 +0.370 19. Qd2 Rfe8 20. Rae1 Rec8 > 21. Qe3 Bc7 >00:00:07.39 3728kn 06/08/19 --------------------------------------------------- >00:00:11.06 5684kn 07/10/21 +0.483 19. Qd2 Rfe8 20. Rae1 Kf8 > 21. cxd5 Nxd5 22. Nxd5 Bxd5 > 23. Rxe8+ Kxe8 >00:00:12.47 6313kn 07/10/21 --------------------------------------------------- >00:00:28.12 14Mn 08/11/22 6/48 19. Rae1 > > Time used: 00:00:30.00 > nps: 497701 nodes: 14936023 Q-nodes: 14513023 (97%) > move order: 88% > hash probes: 112554 hash hits: 26981 (23%) hash usage: 2% > pawn hash probes: 14816435 pawn hash hits: 14807848 (99%) > EGTB probes: 0 EGTB hits: 0 (0%) > >97% Q-nodes!! >In the other positions near this, it was the same. 97-98%. I don't have the most >brilliant Q-search, but it's not totally naive either. I don't do checks, and I >use SEE to order moves and to throw out moves that won't bring the score up >close to alpha. In usual middlegames, I see percentages of 10%-40%. > >So how do your engines do in this positions? Movei find nothing strange in that position and inspite of doing checks in the qsearch. The number of qsearch nodes is less than 50% of the number of nodes. From the first 38159802 nodes it has 17497978 qnodes. Uri >What can be done to lower this number? > >/David
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.