Author: Eelco de Groot
Date: 03:12:22 09/12/03
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Hello Ed (or Lex), I don't know if it has anything to do with he Singular Extensions or the way they are represented in the hash tables, but I noticed already before, with the prerelease version, that it is as if the contents of the hash table don't all get cleared sometimes, when you load a new personality. I only saw a clear sign of it in the position that Richard Harrison posted a while ago here, with the Bishop sacrifice on g6. [D]rq3r2/3bp1kp/5pp1/2pPP3/ppP2P1Q/n2B2R1/P3N1PP/3R2K1 w - - 0 28 If I have tried a personality that finds the winning move I always stop the game and enter "new game" in ChessPartner but I don't reload the engine every time trying a new style. But now with a version that has SEX_HIST_DEPTH_7 and that I'm trying to tune a bit, I can get results that I cannot reproduce. For instance I got Personality hist7_4 00:00:00.3 2,62 1 252 e6 00:00:00.3 2,87 2 524 e6 Be8 00:00:00.5 2,78 3 3642 e6 Be8 Re1 00:00:00.7 2,28 4 11264 e6 Be8 f5 Rh8 fxg6 Bxg6 00:00:00.8 2,30 4 31316 Be4 Nxc4 d6 exd6 Bxa8 00:00:00.9 2,40 4 42406 f5 Qxe5 fxg6 h5 Rf1 00:00:01.1 2,56 5 56862 f5 Qxe5 fxg6 h5 Re1 00:00:01.7 2,31 6 122498 f5 Qxe5 fxg6 h5 Nf4 Qd4+ Kh1 00:00:01.8 2,34 6 143989 e6 Be8 Bxg6 Bxg6 f5 Nxc4 fxg6 00:00:03.9 2,36 7 498259 e6 Be8 Bxg6 Bxg6 f5 Rh8 Nf4 Qe8 00:00:07.1 2,36 8 1081969 e6 Be8 Bxg6 Bxg6 f5 Rh8 Nf4 Qe8 00:00:16.1 1,96 9 2784261 e6 Be8 Bxg6 Bxg6 d6 exd6 f5 Nxc4 00:00:34.6 2,06 9 6323403 Rf1 fxe5 f5 Qd6 fxg6 Rxf1+ 00:01:10.1 2,06 9 13130016 Bxg6 00:01:11.1 2,06 9 6323403 Rf1 fxe5 f5 Qd6 fxg6 Rxf1+ 00:02:18.1 2,15 10 26219508 Rf1 Be8 exf6+ Rxf6 Rh3 00:02:28.2 2,15 10 28146090 Bxg6 00:02:41.2 2,15 10 26219508 Rf1 Be8 exf6+ Rxf6 Rh3 00:04:35.8 1,89 11 53918205 Rf1 fxe5 Qxe7+ Rf7 Qxe5+ 00:04:37.2 1,89 11 54222326 Bxg6 00:08:04.2 1,89 11 96319466 Bxg6 00:20:35.6 6,07 11 252779863 Bxg6 hxg6 Rxg6+ 00:21:49.4 6,07 12 268376077 Bxg6 hxg6 Rxg6+ Kxg6 Rd3 Rh8 f5+ Kf7 which is strange in the sense that Bxg6 already appears at ply nine but gets a fail high error. Reloading the engine, and testing another postion in between to flush the hash, I try again the same version (All 28 Mb hash tables): 00:00:00.3 2,62 1 276 e6 00:00:00.3 2,87 2 544 e6 Be8 00:00:00.5 2,79 3 3602 e6 Be8 Rg4 Rg8 Be4 Kh8 d6 f5 00:00:00.7 2,28 4 10988 e6 Be8 f5 Rh8 fxg6 hxg6 Qe4 00:00:00.9 2,40 4 34446 f5 Qxe5 fxg6 h5 Kh1 00:00:01.1 2,56 5 47643 f5 Qxe5 fxg6 h5 Re1 00:00:01.6 2,31 6 111606 f5 Qxe5 fxg6 h5 Nf4 Qd4+ Kh1 Bb5 00:00:01.7 2,34 6 124126 e6 Be8 Bxg6 Bxg6 f5 Nxc4 fxg6 hxg6 00:00:03.2 1,97 7 374057 e6 Be8 Rg4 Kh8 Bxg6 Bxg6 Rxg6 Nxc4 00:00:03.5 2,36 7 410794 f5 Qxe5 fxg6 h5 Nf4 Bg4 Ne6+ Bxe6 00:00:06.9 1,99 8 1056261 f5 Qxe5 fxg6 h5 h3 b3 Nf4 00:00:11.9 2,01 8 1997886 Kh1 Be8 Bxg6 Bxg6 f5 Qxe5 fxg6 00:00:25.5 2,03 8 4635756 d6 exd6 f5 dxe5 fxg6 h6 Be4 Ra7 00:00:31.7 1,87 9 5853238 d6 exd6 Be4 Nxc4 Bd5 Bb5 exf6+ Rxf6 00:00:38.0 1,87 9 6994322 e6 00:00:38.9 2,36 9 7158674 e6 Be8 Bxg6 Bxg6 f5 Qe8 Nf4 00:01:13.3 2,87 10 13862333 e6 Be8 Bxg6 Bxg6 f5 Qe5 fxg6 h5 00:01:50.1 2,87 11 21952070 e6 Be8 Bxg6 Bxg6 f5 Qe5 fxg6 h5 00:04:24.4 2,87 11 53000944 Bxg6 00:04:27.7 2,87 11 21952070 e6 Be8 Bxg6 Bxg6 f5 Qe5 fxg6 h5 00:06:19.5 2,57 12 76173649 e6 Be8 Bxg6 Bxg6 f5 Qe5 fxg6 h5 00:06:44.2 2,57 12 81100833 Bxg6 00:15:17.3 4,17 12 184690543 Bxg6 hxg6 Rxg6+ Kxg6 Rd3 Rh8 f5+ Kf7 00:25:42.2 4,17 13 315204856 Bxg6 hxg6 Rxg6+ Kxg6 Rd3 Qc8 Notice that Bxg6 comes later (and that there is a strange line at ply eight where suddenly the White King makes a quiet move but that is still possible) Also I can get a result with another version that I cannot reproduce: hist7_5 kan niet kloppen 00:00:00.2 2,06 1 114 exf6+ Rxf6 00:00:00.2 2,55 1 295 e6 00:00:00.3 2,79 2 543 e6 Be8 00:00:00.4 2,72 3 3677 e6 Be8 Rg4 Rg8 Bxg6 Bxg6 f5 Rh8 00:00:00.7 2,23 4 10947 e6 Be8 f5 Rh8 fxg6 hxg6 Qf4 00:00:00.9 2,35 4 42406 f5 Qxe5 fxg6 h5 Qh3 00:00:01.1 2,51 5 52529 f5 Qxe5 fxg6 h5 Re1 00:00:01.6 2,27 6 114685 f5 Qxe5 fxg6 h5 Nf4 Qd4+ Kh1 00:00:03.1 2,31 7 362566 f5 Qxe5 fxg6 h5 Nf4 Bg4 Ne6+ Bxe6 00:00:03.2 2,31 7 379297 e6 00:00:03.4 2,31 7 362566 f5 Qxe5 fxg6 h5 Nf4 Bg4 Ne6+ Bxe6 00:00:06.0 2,31 8 876309 f5 Qxe5 fxg6 h5 Nf4 Bg4 Ne6+ Bxe6 00:00:11.1 2,31 8 1894440 Bxg6 00:00:15.2 2,31 8 2639982 Bxg6 00:00:23.6 5,50 8 4307478 Bxg6 hxg6 Rxg6+ Kxg6 Rd3 Qc8 Rg3+ Bg4 00:00:25.8 5,50 9 4709094 Bxg6 hxg6 Rxg6+ Kxg6 Rd3 Qc8 Rg3+ Bg4 00:03:33.4 4,85 10 43985226 Bxg6 hxg6 Rxg6+ Kxg6 Rd3 Rh8 f5+ Kf7 00:04:21.1 4,85 11 54423645 Bxg6 hxg6 Rxg6+ Kxg6 Rd3 Rh8 f5+ Kf7 It is not confined to the settings of the history depth, with older Betazoid versions where I did not use that option I also saw this (in this position). Has this been reported already before Ed? I hope you can reproduce some of the behaviour at least and try to repair it then? Groeten, Eelco
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