Author: Uri Blass
Date: 13:20:33 05/22/03
Go up one level in this thread
On May 22, 2003 at 15:56:05, Robin Smith wrote: >On May 22, 2003 at 08:41:56, Ulrich Tuerke wrote: > >>On May 22, 2003 at 06:08:47, José Carlos wrote: >> >>>On May 22, 2003 at 01:01:38, Robin Smith wrote: >>> >>>>Often programs will underpromote a pawn in situations where they think capturing >>>>the (under)promoted piece is still the best reply. Can anyone give an example >>>>from an actual game where this underspromotion cost the computer a 1/2 point? >>>> >>>>Robin >>> >>> I can't recall any game with this problem, but it's really easy to fix. I >>>simply order the promotions so that promoting to queen gets searched first. >> >>Isn't everybody doing this anyway ? >>Uli > >A quick look at some SSDF games will convince you that everybody ISN'T doing >this. Or at least if they are, it doesn't solve the problem. Many SSDF games, >including games of some top commercial programs, contain unnecessary >underpromotions. > >The reason I asked is I got a draw against Tiger on an iPaq because it >underpromoted to a bishop of the same color as the bishop Tiger already had! >Instead of capturing this mostly redundant bishop, a different move allowed me >to draw the game. If Tiger had promoted to a queen the capture would have been >forced and I would have lost. > >Robin I can add that I am surprised by the fact that commercial programs do not do it correctly. At the level of movei when I expect a big improvement by other factors it may make sense not to invest time on this but I thought that the commercial programmers will care about this problem. Uri
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.