Author: Uri Blass
Date: 13:44:58 10/11/03
Go up one level in this thread
On October 11, 2003 at 16:04:04, Christophe Theron wrote:
>On October 11, 2003 at 14:12:41, Uri Blass wrote:
>
>>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
>
>
>
>This technique can be indeed extremely dangerous. The FUGU engine, by a strict
>definition, does not play chess!!!
>
>But it's not new. As you say, the previous versions of Junior were not playing
>chess but a slight variant of chess. However it was playing chess brilliantly.
>
>I must pay attention to some cases like the one you mention.
>
>In this case FUGU would not say it's a checkmate. It would just return a low
>score (alpha). So far I have never seen any problem because of it.
>
>
>
> Christophe
Did you test FUGU against tiger15?
Is it already better than tiger15 based on your tests or do you need more tuning
for that purpose.
The impression based on the results of it in the french championship suggests
that at least in that competition it was weaker than tiger15.
Uri
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