Author: Brian Richardson
Date: 12:20:00 06/18/00
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On June 18, 2000 at 12:57:26, Gian-Carlo Pascutto wrote: >On June 18, 2000 at 12:43:32, Brian Richardson wrote: > >>Tinker's results are listed below. Tinker extends one ply during normal "full >>width" search for checks, pawns on 7th, and various recaptures. The 13(30/39) >>indicates that the mate (in 8) was found in the full width search at 13 ply, >>the deepest full width extension was to 30 ply, and the deepest q-search was >>39 ply. Note the score changes at ply 10 and again at ply 12. >> >[snip] >> 10 194 6.48 2344512 1. h3h5 g6h5 2. h1h5 g8f8 3. h5h7 f8e8 >> 4. d3f5 e8d8 5. f5f7 a6a4 6. f7e7 d8c8 >> 7. e7d6 a4a2 8. d6c5 c8d8 >> 10-> 194 7.98 3207267 1. h3h5 g6h5 2. h1h5 g8f8 3. g8f8 f8e8 >> 4. d3f5 e8d8 5. f5f7 a6a4 6. f7e7 d8c8 >> 7. e7d6 a4a2 8. d6c5 c8d8 >> 11 194 8.09 3249107 1. h3h5 g6h5 2. h1h5 >> 11-> 194 11.05 5052676 1. h3h5 g6h5 2. h1h5 >> 12 1915 13:58 444200966 1. h3h5 g8f8 2. h5h7 f8e8 3. h7f7 a6c4 >> 4. d3g6 c4f1 5. h1f1 e8d8 6. g6e6 d8c7 >> 7. c3a5 b7b6 8. f7e7 c7d8 9. e6d6 d8c8 > >Thanks a lot! This is exactly what I was looking for. > >BTW. Do you use an aspiration search (alpha-beta window)? If so how wide. From >what I see here I'd say no but I want to be sure. > >I am using nearly the same extensions (but not on recapture) and I'm getting >very similar results. Except that my program runs 10 times slower and I didn't >have the patience to way for 2 hours ;) > >From what I've got now, my guess would be that the one-on-check is what >kills this search. Fractional ply extensions anyone? ;) > >-- >GCP Not sure about aspiration search--Tinker does limit the window to (-alpha-1,-alpha) after the first move at any ply has been searched, but does not limit the window to begin with, although I think this is normal PVS search. Brian
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