Author: Thomas Mayer
Date: 13:44:48 02/01/05
Hi, I had promised some more interesting results of my experiments with KB*KP* endgames... The following analysis are produced by an alpha version of Quark after implementing KBKP bitbase, a recognizer and a special endgame routine for KB*KP* endgames. 5-men tablebases are disabled. The implementation has definitely NO influence at all to Quarks overall speed. [D] 8/p1p5/3p4/p3p3/k4p2/2K3pB/7p/8 w - - 0 1 A well known position, the lone bishop holds against 8 pawns... I do not know any engine which can even nearly analyse this correct in a reasonable amount of time. (Maybe Yace can, Dieter is a clever guy, I have not tested... :) Let's have a look what Quark v2.47alpha thinks on this: Quark v2.47alpha: 12 00:00 123.374 560.790 -1,66 h3d7 a4a3 d7c6 a5a4 c6h1 a7a5 h1d5 h2h1q d5h1 c7c5 INRHits:2515 12 00:00 141.585 566.340 -1,66 h3d7 a4a3 d7c6 a5a4 c6h1 a7a5 h1d5 h2h1q d5h1 c7c5 INRHits:3532 13 00:00 244.659 556.043 -1,68 h3d7 a4a3 d7c6 a5a4 c6h1 a7a5 h1d5 h2h1q d5h1 c7c6 h1c6 a3a2 c3c4 a4a3 INRHits:5178 13 00:00 276.458 564.200 -1,68 h3d7 a4a3 d7c6 a5a4 c6h1 a7a5 h1d5 h2h1q d5h1 c7c6 h1c6 a3a2 c3c4 a4a3 INRHits:6777 14 00:00 376.445 579.146 -1,68 h3d7 a4a3 d7c6 a5a4 c6h1 a7a5 h1d5 c7c6 d5c6 a3a2 c6d5 a2b1 d5g2 h2h1q g2h1 a4a3 INRHits:8633 14 00:01 435.167 572.588 -1,68 h3d7 a4a3 d7c6 a5a4 c6h1 a7a5 h1d5 c7c6 d5c6 a3a2 c6d5 a2b1 d5g2 h2h1q g2h1 a4a3 INRHits:11399 15 00:01 692.298 581.763 -1,67 h3d7 a4a3 d7c6 a5a4 c6h1 a7a5 h1d5 c7c6 d5c6 a3a2 c6d5 a2b1 d5e4 b1c1 e4h1 c1d1 h1f3 d1e1 c3c4 INRHits:17585 15 00:01 808.902 581.943 -1,67 h3d7 a4a3 d7c6 a5a4 c6h1 a7a5 h1d5 c7c6 d5c6 a3a2 c6d5 a2b1 d5e4 b1c1 e4h1 c1d1 h1f3 d1e1 c3c4 INRHits:21942 16 00:02 1.124.098 588.532 -1,68 h3d7 a4a3 d7c6 a5a4 c6h1 a7a5 h1d5 c7c6 d5c6 a3a2 c6d5 a2b1 d5e4 b1c1 e4h1 c1d1 c3d3 a4a3 d3e4 INRHits:29444 16 00:02 1.358.386 593.181 -1,68 h3d7 a4a3 d7c6 a5a4 c6h1 a7a5 h1d5 c7c6 d5c6 a3a2 c6d5 a2b1 d5e4 b1c1 e4h1 c1d1 c3d3 a4a3 d3e4 INRHits:37674 17 00:03 2.151.581 599.326 -1,98 h3d7? 17 00:05 4.064.056 692.343 -2,21 h3d7 a4a3 d7c6 a5a4 c6d5 a7a5 c3c2 h2h1q d5h1 a3a2 h1d5 a2a1 d5c6 a4a3 c2b3 a3a2 b3a3 e5e4 c6e4 c7c5 g2e4 INRHits:62874 17 00:07 5.256.508 667.069 -2,20 h3g2! 17 00:22 14.434.963 637.305 -2,21 h3d7 a4a3 d7c6 a5a4 c6d5 a7a5 c3c2 h2h1q d5h1 a3a2 h1d5 a2a1 d5c6 a4a3 c2b3 a3a2 b3a3 e5e4 c6e4 c7c5 g2e4 INRHits:305950 17 00:22 14.479.187 639.257 -2,21 h3d7 a4a3 d7c6 a5a4 c6d5 a7a5 c3c2 h2h1q d5h1 a3a2 h1d5 a2a1 d5c6 a4a3 c2b3 a3a2 b3a3 e5e4 c6e4 c7c5 g2e4 INRHits:308271 18 00:23 15.147.797 633.799 -2,22 h3d7 a4a3 d7c6 a5a4 c6d5 a7a5 c3c2 h2h1q d5h1 a3a2 h1d5 a2a1 d5c6 a4a3 c2b3 d6d5 c6d5 c7c6 d5c6 a3a2 INRHits:326694 18 00:24 15.514.814 635.853 -2,22 h3d7 a4a3 d7c6 a5a4 c6d5 a7a5 c3c2 h2h1q d5h1 a3a2 h1d5 a2a1 d5c6 a4a3 c2b3 d6d5 c6d5 c7c6 d5c6 a3a2 INRHits:352358 19 00:26 17.143.833 643.295 -2,20 h3d7 a4a3 d7c6 a5a4 c6d5 a7a5 c3c2 h2h1q d5h1 a3a2 h1d5 a2a1 d5c6 a4a3 c2b3 d6d5 c6d5 c7c6 d5c6 a3a2 b3c4 INRHits:381154 19 00:27 17.752.277 641.803 -2,20 h3d7 a4a3 d7c6 a5a4 c6d5 a7a5 c3c2 h2h1q d5h1 a3a2 h1d5 a2a1 d5c6 a4a3 c2b3 d6d5 c6d5 c7c6 d5c6 a3a2 b3c4 INRHits:417484 20 00:32 21.168.482 648.147 -2,22 h3d7 a4a3 d7c6 a5a4 c6d5 a7a5 c3c2 h2h1q d5h1 a3a2 h1d5 a2a1 d5c6 a4a3 c2c3 a3a2 c3b3 d6d5 c6d5 c7c5 d5c6 a1b1 c6e4 a5a4 INRHits:593733 20 00:33 21.900.935 663.664 -2,22 h3d7 a4a3 d7c6 a5a4 c6d5 a7a5 c3c2 h2h1q d5h1 a3a2 h1d5 a2a1 d5c6 a4a3 c2c3 a3a2 c3b3 d6d5 c6d5 c7c5 d5c6 a1b1 c6e4 a5a4 INRHits:638178 21 00:40 27.154.040 678.851 -2,24 h3d7 a4a3 d7c6 a5a4 c6d5 a7a5 c3c2 h2h1q d5h1 a3a2 h1d5 a2a1 d5c6 a4a3 c2b3 a3a2 b3a3 a5a4 c6d5 c7c5 d5g2 c5c4 g2e4 INRHits:713966 21 00:42 28.346.752 674.922 -2,24 h3d7 a4a3 d7c6 a5a4 c6d5 a7a5 c3c2 h2h1q d5h1 a3a2 h1d5 a2a1 d5c6 a4a3 c2b3 a3a2 b3a3 a5a4 c6d5 c7c5 d5g2 c5c4 g2e4 INRHits:791005 of course this is not perfect, but sufficent, I think... In the line you see, that Quark did understand it. I believe that other engines will produce similar lines, but I have doubts that they score it near to that. You are welcome to test this with some engines... Let's go a bit deeper in the endgame: [Event "Computer Schach Partie"] [Site "SHITHAPPENS"] [Date "2005.02.01"] [Round "?"] [White "Thomas"] [Black "Thomas"] [Result "*"] [BlackElo "2350"] [Time "22:33:40"] [WhiteElo "2350"] [SetUp "1"] [FEN "8/p1p5/3p4/p3p3/k4p2/2K3pB/7p/8 w - - 0 1 "] [Termination "unterminated"] [PlyCount "17"] [WhiteType "human"] [BlackType "human"] 1.Bd7+ Ka3 2.Bc6 a4 3.Bd5 c5 4.Bg2 Ka2 5.Kc2 a5 6.Bh1 Ka1 7.Bg2 a3 8.Bh1 a2 9.* So we get this position: [D] 8/8/3p4/p1p1p3/5p2/6p1/p1K4p/k6B w - - 0 9 Quarks analysis (besides, all on my P3/1200 Laptop Of course I have reseted Quarks hashtables 5 00:00 2.498 249.800 -2,32 h1e4 a5a4 c2c3 a4a3 c3d3 INRHits:10 7 00:00 12.132 404.400 -2,34 h1d5 a5a4 d5e4 a4a3 c2c3 d6d5 e4d5 a4a3 INRHits:101 8 00:00 25.180 419.666 -2,27 h1e4 a5a4 e4d5 c5c4 c2c1 e5e4 d5e4 a4a3 INRHits:328 11 00:00 113.926 542.504 -2,26 h1e4 a5a4 e4d5 c5c4 d5h1 a4a3 h1d5 e5e4 d5e4 d6d5 e4d5 INRHits:2129 12 00:00 134.248 559.366 -2,26 h1e4 a5a4 e4d5 c5c4 d5h1 a4a3 h1e4 c4c3 c2c3 d6d5 e4d5 a1b1 INRHits:2725 12 00:00 155.532 555.471 -2,26 h1e4 a5a4 e4d5 c5c4 d5h1 a4a3 h1e4 c4c3 c2c3 d6d5 e4d5 a1b1 INRHits:3117 13 00:00 180.650 547.424 -2,28 h1e4 a5a4 e4d5 c5c4 d5h1 a4a3 h1e4 c4c3 e4h1 d6d5 h1d5 e5e4 d5e4 INRHits:3952 13 00:00 212.275 558.618 -2,28 h1e4 a5a4 e4d5 c5c4 d5h1 a4a3 h1e4 c4c3 e4h1 d6d5 h1d5 e5e4 d5e4 INRHits:4930 14 00:00 274.342 548.684 -2,15 h1e4 a5a4 e4d5 c5c4 d5h1 a4a3 h1e4 c4c3 e4h1 d6d5 h1d5 e5e4 d5e4 f4f3 g2f3 INRHits:6655 14 00:00 300.106 555.751 -2,15 h1e4 a5a4 e4d5 c5c4 d5h1 a4a3 h1e4 c4c3 e4h1 d6d5 h1d5 e5e4 d5e4 f4f3 g2f3 INRHits:7481 15 00:01 365.359 562.090 -2,15 h1e4 a5a4 e4d5 c5c4 d5h1 a4a3 h1e4 c4c3 e4h1 d6d5 h1d5 e5e4 d5e4 f4f3 e4f3 INRHits:9785 15 00:01 405.765 555.842 -2,15 h1e4 a5a4 e4d5 c5c4 d5h1 a4a3 h1e4 c4c3 e4h1 d6d5 h1d5 e5e4 d5e4 f4f3 e4f3 INRHits:11146 16 00:01 557.760 557.760 -2,00 h1e4 a5a4 e4d5 c5c4 d5h1 a4a3 h1e4 c4c3 e4h1 d6d5 h1d5 e5e4 d5e4 f4f3 e4f3 g3g2 INRHits:16118 16 00:01 620.571 559.072 -2,00 h1e4 a5a4 e4d5 c5c4 d5h1 a4a3 h1e4 c4c3 e4h1 d6d5 h1d5 e5e4 d5e4 f4f3 e4f3 g3g2 INRHits:18419 17 00:01 832.700 555.133 -1,65 h1e4! 17 00:02 995.954 559.524 -1,38 h1e4 a5a4 e4d5 c5c4 d5h1 a4a3 h1e4 c4c3 e4h1 d6d5 h1d5 h2h1q d5h1 f4f3 h1f3 e5e4 f3e4 INRHits:30032 17 00:02 1.091.918 559.957 -1,38 h1e4 a5a4 e4d5 c5c4 d5h1 a4a3 h1e4 c4c3 e4h1 d6d5 h1d5 h2h1q d5h1 f4f3 h1f3 e5e4 f3e4 INRHits:33185 18 00:03 2.059.706 567.412 -1,23 h1e4 a5a4 e4d5 c5c4 d5h1 a4a3 h1e4 c4c3 e4h1 d6d5 h1d5 h2h1q d5h1 f4f3 h1f3 e5e4 f3e4 g3g2 INRHits:65938 18 00:04 2.204.087 518.608 -1,23 h1e4 a5a4 e4d5 c5c4 d5h1 a4a3 h1e4 c4c3 e4h1 d6d5 h1d5 h2h1q d5h1 f4f3 h1f3 e5e4 f3e4 g3g2 INRHits:73115 19 00:05 2.907.600 553.828 -0,78 h1e4! 19 00:06 3.520.072 563.211 0,00 h1e4 h2h1q e4h1 e5e4 h1e4 c5c4 e4h1 d6d5 h1d5 g3g2 d5g2 f4f3 g2f3 c4c3 f3h1 a5a4 h1g2 a4a3 g2h1 INRHits:107151 19 00:06 3.858.276 570.750 0,00 h1e4 h2h1q e4h1 e5e4 h1e4 c5c4 e4h1 d6d5 h1d5 g3g2 d5g2 f4f3 g2f3 c4c3 f3h1 a5a4 h1g2 a4a3 g2h1 INRHits:118274 20 00:09 5.094.121 565.385 0,00 h1e4 h2h1q e4h1 e5e4 h1e4 c5c4 e4h1 d6d5 h1d5 g3g2 d5g2 f4f3 g2f3 c4c3 f3h1 a5a4 h1g2 a4a3 g2h1 INRHits:153665 20 00:09 5.526.742 566.264 0,00 h1e4 h2h1q e4h1 e5e4 h1e4 c5c4 e4h1 d6d5 h1d5 g3g2 d5g2 f4f3 g2f3 c4c3 f3h1 a5a4 h1g2 a4a3 g2h1 INRHits:171991 21 00:10 5.911.715 576.190 0,00 h1e4 h2h1q e4h1 e5e4 h1e4 c5c4 e4h1 d6d5 h1d5 g3g2 d5g2 f4f3 g2f3 c4c3 f3h1 a5a4 h1g2 a4a3 g2h1 INRHits:183063 21 00:11 6.500.600 577.317 0,00 h1e4 h2h1q e4h1 e5e4 h1e4 c5c4 e4h1 d6d5 h1d5 g3g2 d5g2 f4f3 g2f3 c4c3 f3h1 a5a4 h1g2 a4a3 g2h1 INRHits:211417 22 00:12 7.104.087 579.452 0,00 h1e4 h2h1q e4h1 e5e4 h1e4 c5c4 e4h1 d6d5 h1d5 g3g2 d5g2 f4f3 g2f3 c4c3 f3h1 a5a4 h1g2 a4a3 g2h1 INRHits:229468 22 00:13 7.928.700 586.442 0,00 h1e4 h2h1q e4h1 e5e4 h1e4 c5c4 e4h1 d6d5 h1d5 g3g2 d5g2 f4f3 g2f3 c4c3 f3h1 a5a4 h1g2 a4a3 g2h1 INRHits:274146 It does really work... Well, Vincent might be right -> anyway, I think the nearly understanding of such positions MUST have some influence on it's endgame strength, I will continue to work on this... Greets, Thomas
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