Author: Bob Durrett
Date: 09:36:08 09/12/03
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On September 12, 2003 at 09:46:24, Gian-Carlo Pascutto wrote: >On September 12, 2003 at 09:03:47, Bob Durrett wrote: > >>There is a computer programming issue here, too. Are the position evaluation >>scores displayed on the monitor actually used by the engine during the >searches? > >They are vital and used everywhere. > >>Maybe Shredder's evaluation scores are usually correct >>and all the rest are off! [Everybody's out of step except Shredder]. > >Looking at the SSDF, Shredder surely can't be doing too badly, can it? > >-- >GCP Actually, GCP, you and I are talking past each other. You are talking about apples and I am talking about oranges. We are each discussing a different topic. The SSDF tests are timed tests. The engines are compared based on whatever moves they can come up with in a given amount of time. What do you suppose the results would be if each engine were allowed to reach some preset search depth [>16] before each move? In this proposed [hypothetical] competition, the engines would be forced to move as soon as they reached the required search depth but not allowed to move prior to reaching that depth. [As a refinement, the pre-determined depth might be set to be greater in endgames, perhaps >18.] In such a competition, I suspect that Crafty would come out on top of the rating list simply because Hyatt says Crafty does very little pruning. [This assumes that the Crafty operator does not shut the engine off due to boredom. : )] Also, note my comment regarding whether or not any kind of "bias" would affect the selection of the move. Consider two hypothetical engines identical except that one engine's position evaluation software gives position evaluations exactly double those of the other. Would you expect one engine to perform better than the other insofar as selection of the move to play is concerned? I would not. The user, however, cares about the accuracy of the evaluation score. Double the correct value is no good for the user. My concern was with what the GUI displays to the user. What happens inside the guts of the engine is for engine programmers to consider. I am a user and you are a chess programmer. ["I am a pear and you are a peach."] Bob D.
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