Author: Tord Romstad
Date: 03:00:33 02/22/05
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On February 21, 2005 at 20:16:31, Dann Corbit wrote: >On February 21, 2005 at 19:16:31, Anthony Cozzie wrote: > >>On February 21, 2005 at 13:40:37, Dann Corbit wrote: >> >>>This is on the 2.2 GHz 64 bit computer (which had fewer problems than the slower >>>machine). The first set is the raw data, and the second set has had all >>>duplicate games removed. >>> >>> Program Elo + - Games Score Av.Op. Draws >>>1 Polyglot fruit-book : 2553 31 35 372 59.9 % 2483 18.3 % >>>2 Polyglot glaurung-book : 2540 32 35 372 57.5 % 2487 16.7 % >>>3 Polyglot glaurung-no-book: 2481 32 34 372 46.2 % 2507 16.7 % >>>4 Polyglot fruit-no-book : 2427 40 29 372 36.3 % 2525 14.0 % >>> >>> Program Elo + - Games Score Av.Op. Draws >>>1 Polyglot fruit-book : 2550 32 37 348 59.3 % 2484 17.5 % >>>2 Polyglot glaurung-book : 2536 33 35 363 56.7 % 2489 16.5 % >>>3 Polyglot glaurung-no-book: 2483 33 36 343 46.9 % 2505 16.9 % >>>4 Polyglot fruit-no-book : 2430 41 30 354 36.9 % 2524 12.7 % >>> >>>It seems that Fruit may benefit from a book slightly more than glaurung. At >>>least, in the case of fruit, there is now enough data to say for sure that a >>>book does help >> >>Perhaps this just means Tord's book sucks? It does, without a doubt. Glaurung's opening book code and the book itself were created in just a couple of hours on a very busy afternoon. The book is built from a big PGN database, and it appears that my criterions for which moves to include in the book were far from perfect. In Dann's experiment, as he points out, Glaurung didn't use its own book anyway. Both engines were using the same PolyGlot book. Of course this book was not optimised for either engine, which means that this experiment does not answer the question of whether a sufficiently good book is worth 700 Elo points. To me, however, the question of how big the difference between a random book and no book is is also an interesting one. >In both cases, the exact same book was used via Polyglot. The default book for >Glaurung was renamed so that only the special polyglot book would ever be in >use. There is no reason to rename Glaurung's book. Just change "OwnBook = true" in the polyglot.ini file to "OwnBook = false". Tord
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