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Subject: Re: Crafty prefers Q over 2 Rooks ? Re: Piece Values in Chess Programs

Author: Brian Richardson

Date: 18:14:54 05/07/01

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On May 07, 2001 at 16:30:26, Robert Hyatt wrote:

>On May 07, 2001 at 16:15:08, Brian Richardson wrote:
>
>>In general...
>>
>>I don't know about adding pawns to the mix (per the Crafty/Diep games), but in
>>evaluate.c, Crafty seems toI prefer the single queen to 2 rooks, or am I missing
>>something...
>>
>>   else if (WhiteMajors == BlackMajors) {
>>      if (WhiteQueens && !BlackQueens) score+=BAD_TRADE>>1;
>>      else if (!WhiteQueens && BlackQueens) score-=BAD_TRADE>>1;
>>    }
>
>That is where I correct the score to avoid tweaking with piece values and
>seeing nonsense moves that do bad things.  This says that a queen is only
>a little worse than two rooks.  Which means that if I have a queen and a pawn,
>vs two rooks (and ignoring everything else on the board) then the queen and pawn
>are a little better as the two rooks will never win.
>
>that is nothing compared to the bonus Vincent tosses in for Q vs 2R...

OK, but it looks like Crafty prefers the white queen to the 2 black rooks with
score += BAD_TRADE (and vice versa)...or do I have it backwards?

Thanks
Brian



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