Author: Uri Blass
Date: 06:38:32 02/23/04
Go up one level in this thread
On February 23, 2004 at 09:36:46, Uri Blass wrote: >On February 23, 2004 at 09:06:31, Gerd Isenberg wrote: > >>On February 23, 2004 at 07:02:59, martin fierz wrote: >> >>>aloha, >>> >>>i have a question about pins. pins are a rather important feature in chess; some >>>of them are not so bad, some are deadly. i just happened to chat briefly with >>>anthony cozzie on ICC, and he said he didn't do any pin detection. i detect >>>pins, but i don't evaluate whether a pin is not so bad or deadly. my questions >>>are: >>>-> are you detecting pins in your program? >>>-> if yes, do you try to distinguish between different pins? >>> >>>cheers >>> martin >> >>Hi Martin, >> >>yes i detect pins, (not only) because i do legal move generation. >>With disjoint direction attacks (from sliders as well from the king as >>metasliders) it is rather cheap to get them without branches. >> >>In Eval i consider (from memory): >> >>1.) what kind of piece/pawn is pinned. >>2.) whether the pinner (?) is en prise or attacked by equal valued pieces. >>3.) The distance from pinned piece to the king (>2) and whether the pinned piece >>is member of the "own" side of the board... >>4.) whether the pinned piece is defended or defendable (in one move) by pawns. >>5.) whether the piece is attackable by opposite pawns. >>6.) a kind of SEE value considering all other attackers/defendes. >> >>In Eval i even consider other "tactical" stuff, like forks, overloading pieces >>and pins to other valueable or hanging pieces. >> >>Cheers, >>Gerd > >I wonder what is the reason that with all of this very impressive stuff you >consider Yace and Sos as stronger than your program based on another post. > >What is your opinion the relative advantages of program like Crafty relative to >your program and I am not talking about parallel search because yace is not >stronger than Crafty on one processor based on the results that I read. > >I wonder if you really test every change that you do in the evaluation to test >if it is productive. > >I test every single change that I accept in the evaluation first in positions >and later in blitz games(except cases that the change is relevant only to a very >small class of positions) and if I do not get positive result in blitz games I >reject the change. > >It is one of the reasons that I have relatively simple evaluation. >The second reason is that I do not work enough on my program. > >Uri I forgot the third reason and it is that I consider search as more important than evaluation at least in the level of my program. 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.