Author: Georg v. Zimmermann
Date: 07:50:43 06/28/02
Go up one level in this thread
>When I not use NULL_MOVE... > >7 10 1193981 144 b7c6 d8g5 g2g3 g5f6 c6c7 f6d8 c7d8 >8 24 2718604 119 b7c6 d8g5 g2g3 g5g4 c6c7 g4h3 d5f7 f8f7 d2d4 >8 45 5346462 142 d2d4 f3g2 g1g2 d8d7 f2f3 c6a5 b7a8 f8a8 >9 2.26 17985432 117 d2d4 a8b8 b7c6 f3e2 d4c5 e2b5 c1g5 d8g5 c6b5 >9 23.13 150477475 59 d2d4 a8b8 b7c6 f3e2 d4c5 e2b5 c1g5 d8g5 c6c7 > >...my program see it at depth 8 after 45 seconds. Problem is probably >in NULL_MOVE, but where? Like I said: >>(1.xc6 >>Qg5 2. g3 Qh5 3. Bxf7+ Kxf7 4.Qxc7+ Kg8 5.h4 Qg4 6.null Qh3 7.null, just >>guessing) . NullMove makes you see some tactics later. It's a trade-off. >What is threat-extension? When it is used? Look at crafty source. You can extend when the null move search failed low with a checkmate score telling you : "this position is dangerous, I get mated if I dont move". Note this needs fail soft with the usual null-window null move search of course. Georg
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.