Author: Mikael Bäckman
Date: 03:32:34 05/01/04
Go up one level in this thread
On April 30, 2004 at 23:04:24, Andrew Wagner wrote:
>Here's the position:
>
>[d] 8/7p/5k2/5p2/p1p2P2/Pr1pPK2/1P1R3P/8 b - -
>
>The move to find here is Rxb2. My question is...what ply does your program find
>the solution on? To tactically work it out to see that you can force queening
>requires something like 13 or 14 ply. This is an interesting knowledge vs.
>search position...can you special-case this somehow to find it sooner? The
>problem is, as an FM friend of mine pointed out, if the king were just a bit
>closer, the sac is losing. E.g. In this position:
>
Chepla needs 14 plies. I don't use pawnpush extensions and my evalweights are
probably too small.
score nodes time
-1.48 5716k 5.8 Rxb2! Rxb2 c3 Rb6+ Ke7 Rb7+ Kd6 Rb6+ Kc5 Rb7 c2 Rc7+
Kd6 Rxh7 c1=q Rh6+ Ke7 Rd6 14/28
-2.48 5839k 5.9 Rxb2! Rxb2 c3 Rb6+ Ke7 Rb7+ Kd6 Rb6+ Kc5 Rf6 c2 Rxf5+
Kc4 Ra5 c1=q Rxa4+ Kb3 Rd4 d2 14/27
-3.29 7036k 7.3 Rxb2 Rxb2 c3 Rb6+ Ke7 Rb7+ Kd6 Rb6+ Kc7 Rb1 c2 Rc1 Kd7
h4 d2 Rxc2 d1=q+ Re2 15/29
/Mikael
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.