Author: Vasik Rajlich
Date: 02:34:22 06/15/05
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On June 14, 2005 at 16:03:42, Roger D Davis wrote: >Looks like the latest editions of Fruit and Fruit-Toga are very strong. Is there >any single structural feature that makes them so strong? Is it speed, or tuning, >or what? > >Roger This is a very interesting question. My first thought on seeing the Fruit 2.0 code was: it can't possibly be so easy. I think the main thing is that Fabien is able to keep the priorities straight. For example, it's very easy to go into the evaluation and change it so that it is able to understand some specific position. This usually applies to something like a king attack - you want to give the right, high score. The problem is, what about everything else? Now you start over-evaluating non-existent attacks, etc. Ditto for search. You start extending something because of course it should be extened, or reducing because it makes so much sense - but this ends up backfiring in other positions. In chess, the principle that positions closer to the root are more important than positions further from the root is really strong. When in doubt, don't break it! The same applies to increasing speed - although there the side effects are "only" developer time & bugs rather than directly weakening the engine. As a general rule, if you're not sure about some complexity, drop it. (Of course, easier said than done.) Vas
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