Author: Stuart Cracraft
Date: 21:09:16 08/10/04
Go up one level in this thread
Okay, so I just robbed from Peter (GNU) to try it with Paul (GA).
Relevant code is:
quiesce
:
while another capture
#ifdef DELTAPRUNE
#define MARGIN 200
delta = MAX(alpha-MARGIN-baseval,0);
if (see(bd,qml[mvi].to) < delta) {
mvi++;
continue;
}
#endif
proceed normally
:
This uncovers the following improvement:
// without delta
// 2.02j 7.10/25.40 93% 28/30 25.89 6803985 226800/1/262783 0/0/310215/0/0/0
// with delta (GNU style)
// 2.02j 7.80/18.07 93% 28/30 25.01 5822842 194095/1/232811 0/0/113356/0/0/0
So searching 0.7 ply deeper in the main search and much less in the quiescence
with 14% fewer nodes.
Probably something better than this is possible.
It can also always use see>=0 restriction after "proceed normally" above
more cutoffs. I'll try the overnight run with a combination of nothing,
delta, and see>=0.
Stuart
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.