Re: Weakening GNU Chess

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Article #1885

#1885

From: Simon Waters
Date: Fri, 18 Jan 2002 00:34

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David Jaquay wrote:
> 
> Is it possible (or, preferably, easy) to weaken GNU Chess 5.x to play
> weaker players? 

Well if your after "open source" so you don't mind recompiling
it right?

First lose the opening book (just rename the book.dat file), or
"book off" at the command line (No good for xboard or winboard).

Then shrink the default HASHSIZE right down (hashsize at the
commandline), but it is easier to buid it with a smaller
hashsize in common.h

This doesn't help much but it is the right direction.....

To get enterprising but not strong chess edit the CTL function
in eval.c, and multiply up the central control, mobility, and
king attack bonuses being added by a nice big factor (try 3 or 4
for each, just cut and paste the "s += n" lines a few times
where you find it).

This will make the program play harder for central control and
the like and care less about material. It'll still play a
recognisable and mean game of chess, but it won't be playing
2100 level.

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From: Simon Waters <Simon@wretched.demon.co.uk>
Newsgroups: gnu.chess
Subject: Re: Weakening GNU Chess
Date: Fri, 18 Jan 2002 00:34:44 +0000
Organization: Eighth Layer Limited
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