Author: Christophe Theron
Date: 22:45:10 12/01/98
Go up one level in this thread
On December 01, 1998 at 20:36:09, Kim Hvarre wrote:
>Hello Ed,
>
>Exiting project You and Chistophe have going with The Tiger. In this relation
>just one question, quoting Your homepage:
>
>"One of CHESS-TIGER's search algorithms has been implemented in REBEL and is
>further improved by Ed Schröder. The CHESS-TIGER idea plus Ed's own improvements
>have speed up REBEL with a factor of 2-3. The first results are very promising.
>At the playing level of 1:00 per move REBEL scores 47½-31½ against various
>strong computer opponents.
>
>For the moment the conclusion is Christophe's idea has given REBEL an elo jump
>of at least 30 elo points but more likely the gain in playing strength is 50 elo
>points or even more. The basic idea is im-plemented in the third party engines
>of:"
>
>The question: The large jump in speed is this on behalf of something else
>(knowledge, whatever) or is it just a "simple trick"/algoritme/?, You and
>perhaps others have overseen?
>If so, it's a rather amusing and a nice perspective in respect to the promising
>future of search.
>
>Regards,
>
>kim
Maybe Ed will answer too, but I can give you some info.
As Ed and I have suspected right from the begining of the project, Rebel and
Tiger are very very different programs.
It appears that we use different algorithms to achieve a relatively close level
of play.
Some of these algorithms are incompatible with each other by nature. Maybe we
will be able to get something by exchanging them, but it is not sure.
But there are other algorithms that are compatible in both programs. And this is
very interesting. Ed has found ideas that I have not found, and the opposite is
true also. In the case Ed describes, one of Tiger's selection algorithms that
did not exist in Rebel has been successfully implemented in Rebel.
This algorithm is not really a programmer's trick. It is an idea taking
advantage of the nature of the chess game. I cannot say more, but I would rather
describe this as being knowledge, because it would certainly not work with other
games.
And what is more exciting is that Ed -probably angry that he did not find the
idea himself- decided to improve it further. :)
And he succeeded! This time I can learn from the changes he has done to my own
algorithm and improve Tiger in return!
I expect this to happen again several times, with different things. We have just
begun exchanging ideas, and there is already a concrete result!
Christophe
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