Author: Uri Blass
Date: 11:12:41 10/11/03
Go up one level in this thread
On October 11, 2003 at 14:05:35, Steve Maughan wrote:
>Christophe,
>
>>1) I have written an extra engine core ("FUGU") which is extremely "tight". It
>>updates an internal representation of the board that is simpler than the one
>>of the classical Tiger engine, and it does not apply all the rules of chess
>>(some rules like en-passant, castling, underpromoting and 50-moves rule are
>>complex to handle and slow the engine down significantly). Doing without some
>>rules in the deepest part of the tree goes mostly unnoticed and help to speed
>>the engine up tremendously.
>
>Now that is an interesting idea. I have heard of top programs that ignore some
>rules for the whole of the search tree (e.g. Junior 5 ignored underpromotion)
>but I haven't heard of anyone ignoring some rules when near the tips of the tree
>(which is most of the search).
>
>Regards,
>
>Steve
I guess that ignoring the rules is dependent on alpha and beta(otherwise it is
dangerous because the program may see mate based on the assumption that the
opponent cannot play an enpassant capture and only later consider the capture
and find that the mate was an illusion).
I hope that at least when new tiger announce mate it does not prune enpassent
captures or underpromotions of the opponent.
Uri
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