Author: Tord Romstad
Date: 07:56:21 10/02/03
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On October 02, 2003 at 08:09:41, Anthony Cozzie wrote: >On October 02, 2003 at 05:21:45, Tord Romstad wrote: > >>I have just finished a 100-game test match between a version of Gothmog with >>the Botvinnik-Markoff extension and an identical version without the extension. >>The version with the new extension added won by 56.5-43.5. >> >>Not enough data to make any definite conclusions, of course, but it certainly >>looks interesting. >> >>Tord > >Could you post some positions where BM-Gothmog was able to outthink ordinary >Gothmog? Unfortunately I haven't studied any of the games -- I just left the match running overnight, and checked the result when I came back to my office this morning. The only position I can offer you now is WAC141, which is solved in 8 plies (about 6 seconds) without the extension, and in 7 plies (about 1.5 seconds) with the extension added. >Just offhand, it seems to me like this extension would extend a lot of >useless things, but your result seems to indicate otherwise. It is not terribly expensive, at least not with my implementation (I only extend when the threat is rather serious). In non-tactical positions, the slowdown is hardly noticable. In tactical positions, I need about 10-20% more nodes to search to the same search depth, but apparently this is outweighed by the fact that a few tactical shots are seen one ply earlier. I am running a second 100-game match now. After 89 games, BM-Gothmog leads by 12 points. I'm beginning to believe that this thing works! :-) Tord
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