Author: Tord Romstad
Date: 05:19:58 01/12/04
Go up one level in this thread
On January 12, 2004 at 07:59:23, Anthony Cozzie wrote: >On January 12, 2004 at 05:37:48, Tord Romstad wrote: > >>FEN, please? >> >>Tord > >[D]r6r/k4pp1/pq2p2p/1p1n4/3N3P/1R6/PPP1QPP1/2KR4 w - - 25 Thanks! >One of the reasons I like this position is that Crafty needs some minutes to >come up with the solution. Gothmog should have no trouble: this position is >very sensitive to checks in qsearch. If you do recapture extensions you will >find it even earlier. . . . Actually, Gothmog doesn't find it that easily. It needs longer time (but much fewer nodes) than Zappa to find Nxb5+. The right move is found after 10 plies, 13 seconds and 2.4 million nodes on a PIV 2.4 GHz. I don't do checks everywhere in the qsearch, but only at nodes where the engine guesses that it is necessary. This is of course not an easy guess to make, and it doesn't work perfectly. The main factors influencing the decision are the material left on the board, the king safety evaluation, the tactical complexity of the position, the static eval for the node, and the upper and lower bounds for the root score. Recapture extensions are not used at all in Gothmog. I've tried them many times, but they never worked for me. Tord
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.