Author: Bruce Moreland
Date: 09:37:10 09/02/01
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On September 02, 2001 at 05:39:32, Frank Phillips wrote: >Does position 2 benefit from (Deep Blue style) singular extension? As far as I know, this one responds well to singular-extension. >I ran this overnight on mine and was pretty disappointed. It took about five >hours and ply 16 before it finally latached onto Rxc5 with a positive score >(greater than a minor, less than a rook). Before then if eventually favoured >the draw by Bf6. You found the correct line then. The first time my program solved this, it was on a P6/200 or something, and it took 24 hours, and everyone laughed at me. Some of these aren't easy. These days my program finds this one quickly, sometimes. Other times it gets hung up on Bf6, which as you note resolves to a draw score. Sometimes my program finds Rxc5 with +2 or 3 or whatever, right off the bat, and other times it ends up with a slightly negative score for a few plies. >(The test also showed that, for test like these, I need bigger counters for >nodes and stuff. According to the log file I was doing 41Knps on a Tbird >1.2GHz. I am slow, but not that slow.) You have to use a 64-bit counter these days. bruce > >Frank
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