Author: Robert Hyatt
Date: 13:12:40 02/04/04
Go up one level in this thread
On February 04, 2004 at 10:56:01, Bryan Hofmann wrote:
>On February 04, 2004 at 09:49:37, Robert Hyatt wrote:
>
>>On February 04, 2004 at 06:16:53, Mike S. wrote:
>>
>>>In the Crafty doc, I found:
>>
>>>
>>>Does the search and evaluation remain the same (so that results from test suites
>>>should be the same), with or without computer option?
>>
>>No. "computer" also disables some asymmetry in the evaluation that is more
>>important when playing humans that want to "close" the position whenever
>>possible.
>>
>
>Strange, the only thing I see is the follow for pawn ram penalty that is not
>calculated if the computer command is used.
>
Not sure what you mean by "strange". I said it turns off some asymmetry dealing
with blocked positions. That is what pawn rams are. :) One component of the
"blocked position" stuff. I think/thought I used to turn off more, but that has
changed a lot over the past couple or three years so maybe not.
>
>
>/*
> ************************************************************
> * *
> * now add in the pawn ram penalty. the idea here is *
> * that rams hinder tactics by blocking the position, *
> * which sidesteps the computer's strong point. *
> * *
> ************************************************************
> */
> if (use_asymmetry && !computer_opponent) {
> if (root_wtm) {
> if (TotalWhitePawns > 5)
> score -= pawn_rams[PopCnt(WhitePawns & (BlackPawns << 8))];
> } else {
> if (TotalBlackPawns > 5)
> score += pawn_rams[PopCnt(WhitePawns & (BlackPawns << 8))];
> }
> }
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