Computer Chess Club Archives




Subject: Re: MTD(f)

Author: Tord Romstad

Date: 04:39:45 01/15/04

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On January 15, 2004 at 06:54:37, Uri Blass wrote:

>I am interested in what bonus you give for passed pawns that can safely advance
>and if you use the side to move to decide about the bonus.

It depends on how far advanced the passed pawn is.  For passed pawns on
the 7th rank, I increase the bonus by 200 or 100 (depending on the side to
move) if the pawn can advance safely.  At the 6th rank, the numbers are 80
and 60.  If the pawn is further back, I don't care about the side to move,
and use a bonus of 20.  My evaluation unit is "binary centipawns", i.e.

These values are entirely untuned and are almost certainly not optimal.
Like most of my evaluation parameters, I have never found the time to
experiment with different values.


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