Author: Greg Lindahl
Date: 17:18:55 12/20/99
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On December 20, 1999 at 19:55:33, Robert Hyatt wrote: >Remember that there are at _least_ as many that spend less time in the eval >than I do. And that I doubt if anybody is as high as 90%. I know of one example which spends 90% in eval. And as you know, if eval becomes cheaper, it might behoove you to use more of it. >DB didn't, but belle did, and hitech did, and so forth. I disagree. You can't prove that no other approach produces a really fast engine. It's logically impossible with the data that you have in hand. > There is no one > piece you can pick out and make execute in zero time, and produce any big > performance boost. Other than an engine which spends 90% of its time in eval. They tell me that this is a religious issue in the chess world -- how smart of an evaluation function to use, how clever you can be picking moves, etc etc. What you're asserting is that you know every possible permutation, algorithm, and factor. Quite a strong claim. I wish I was that smart in the field that I specialize in. >>The DB approach maximized the design cycle length and costs. > >No, no, _NO_... > >They spent 12 years maximizing _performance_. Not anything else. They >built on 10 years of Belle doing the same. It was all about performance. >No, they didn't use the most expensive production process. Designing and making ASICs is very expensive compared to simply writing software. Perhaps they didn't use the most expensive ASIC possible, but they did spend more money than many other approaches, and debugging an ASIC does involve a very lengthy process (3 months fab turnaround, anyone?). Compared to every other previous effort, they had the longest cycle and higest costs. Thus, the DB approach maximized the design cycle length and costs, compared to other potential approaches which did not use such a huge, mucking ASIC. It's a pretty simple point to make. -- g
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