Computer Chess Club Archives

Search

Terms

Messages

Subject: Re: Positional scores in Eval()

Author: Vincent Diepeveen

Date: 14:08:49 04/09/01

Go up one level in this thread

On April 09, 2001 at 16:49:21, Normand M. Blais wrote:

>On April 09, 2001 at 16:21:56, Andrei Fortuna wrote:
>
>
>>positional score > 2 PAWN_VALUE. And that will hurt my quiescence and my
>>futility pruning if I assume that 2*PAWN_VALUE is max positional score. It all
>>boils down to the magnitude of the positional scores versus pawn value, I think
>>I have to choose either to keep big bonuses and turn futility off (or set a
>>bigger margin for futility but in that case it would make futility more
>>inefficient) or keep small bonuses and enjoy the reductions I get from futility
>>and quiescence.
>
>What if you multiply the value of the material by 10 (i.e. pawn = 1000 Knight =
>3000 Bishop = 3000 Rook = 5000 Queen = 10000 ) and keep the positional score as
>it is.
>
>N.M.B.

then his program will volunteerly
accept a pawn and get mated a few moves later.

A good test position is DIEP - crafty wmccc2000:

e2-e4     (2:00:00,2:00:00)  book
c7-c5     (2:00:00,1:59:19)
g1-f3     (2:00:00,1:59:19)  book
d7-d6     (2:00:00,1:59:06)
d2-d4     (2:00:00,1:59:06)  book
c5xd4     (2:00:00,1:58:48)
f3xd4     (1:59:59,1:58:48)  book
g8-f6     (1:59:59,1:58:21)
b1-c3     (1:59:59,1:58:21)  book
a7-a6     (1:59:59,1:58:02)
c1-g5     (1:59:59,1:58:02)  book
e7-e6     (1:59:59,1:57:44)
f2-f4     (1:59:59,1:57:44)  book
d8-b6     (1:59:59,1:57:29)
d1-d2     (1:59:59,1:57:29)  book
b6xb2     (1:59:59,1:57:16)
a1-b1     (1:59:59,1:57:16)  book
b2-a3     (1:59:59,1:56:53)
f4-f5     (1:59:59,1:56:53)  book
b8-c6     (1:59:59,1:56:28)
f5xe6     (1:59:59,1:56:28)  book
f7xe6     (1:59:59,1:55:59)
d4xc6     (1:59:59,1:55:59)  book
b7xc6     (1:59:59,1:55:43)
e4-e5     (1:59:59,1:55:43)  book
d6xe5     (1:59:59,1:51:36)
g5xf6     (1:59:59,1:51:36)  book
g7xf6     (1:59:59,1:50:43)
c3-e4     (1:59:59,1:50:43)  book
f8-e7     (1:59:59,1:46:38)
f1-e2     (1:59:59,1:46:38)  book

Here crafty played O-O?? it castled straight into the mate here by
doing that. O-O is a big blunder. Diep wmccc2000 played h5 there.

Let's have a look whether current version also does that...





best regards,
Vincent

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.