Author: Chris Taylor
Date: 02:26:55 07/31/00
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On July 31, 2000 at 02:25:37, Poschmann wrote: >In a magazine I found the following position. It should be a draw ? >Unfortunately I don't have the following issue of the magazine with the >solution. >It is a 6-piece-endgame. I tried to solve it with the help of Fritz6 >(without tablebases), but I can't. > >[D]K7/8/4k3/1R1R4/8/8/p7/7r w - - > >I had the following to ideas: >a) Go to a 5-piece-endgame: >1. Re5+ Kf6 2. Rf5+ Kg6 3. Rg5+ Kh6 4. Rh5+ Rxh5 5. Rb6+ Kg5 6. Ra6 Rh2 > >b) Allow Black to promote the pawn: >... 4. Rge5 a1=Q+ 5. Ra5 > >I think in both cases White loses the game. But I can't proof it without >tablebases. >- Can somebody with the 5-piece-tablebases proof position a) >- Are some 6-piece-tablebases available to proof position b) without a pawn or > the initial position with one pawn. >- Is there somebody who knows the initial position and its solution ? > >Thank you >Ralf Poschmann Here is some analasis via Crafty 17.10 with all the 3,4,and 5 endgame stuff.. K7/8/4k3/1R1R4/8/8/p7/7r w - - 0 1 Analysis by Crafty 17.10: 1.Kb7 a1Q -+ (-4.80) Depth: 1/2 00:00:01 1.Re5+ -+ (-4.40) Depth: 1/2 00:00:01 1.Re5+ Kd6 +- (2.48) Depth: 1/2 00:00:01 1.Re5+ Kd6 2.Rbd5+ Kc6 +- (2.42) Depth: 2/5 00:00:01 1.Re5+ Kd6 2.Rbd5+ Kc6 3.Rc5+ Kb6 +- (2.36) Depth: 3/7 00:00:01 1.Re5+ Kf6 2.Rf5+ Kg6 3.Rg5+ Kh6 4.Ra5 a1Q 5.Rxa1 Rxa1+ = (0.00) Depth: 4/9 00:00:02 1.Re5+ Kf6 2.Rf5+ Kg6 3.Rg5+ Kh6 4.Ra5 a1Q 5.Rxa1 Rxa1+ = (0.00) Depth: 5/11 00:00:02 1.Re5+ Kf6 2.Rf5+ Kg6 3.Rg5+ Kh6 4.Ra5 a1Q 5.Rxa1 Rxa1+ = (0.00) Depth: 6/15 00:00:02 12kN, tb=34 1.Re5+ Kf6 2.Rf5+ Kg6 3.Rg5+ Kh6 4.Ra5 a1Q 5.Rh5+ Rxh5 6.Rxa1 = (0.00) Depth: 7/15 00:00:02 21kN, tb=85 1.Re5+ Kf6 2.Rf5+ Kg6 3.Rg5+ Kh6 4.Ra5 a1Q 5.Rh5+ Rxh5 6.Rxa1 Kg5 = (0.00) Depth: 8/19 00:00:02 37kN, tb=138 1.Re5+ Kf6 2.Rf5+ Kg6 3.Rg5+ Kh6 4.Ra5 a1Q 5.Rh5+ Rxh5 6.Rxa1 Kg5 7.Ka7 = (0.00) Depth: 9/19 00:00:03 54kN, tb=309 1.Re5+ Kf6 2.Rf5+ Kg6 3.Rg5+ Kh6 4.Kb8 a1Q 5.Kb7 Qf6 6.Rg3 Qe6 7.Ra5 -+ (-4.35) Depth: 10/23 00:00:05 362kN, tb=610 1.Re5+ Kf6 2.Rf5+ Kg6 3.Rg5+ Kh6 4.Kb7 a1Q 5.Rg8 Rb1 6.Rxb1 Qxb1+ 7.Kc6 Qc2+ 8.Kd6 Kh5 -+ (-4.35) Depth: 11/26 00:00:08 748kN, tb=1426 1.Re5+ Kf6 2.Rf5+ Kg6 3.Rg5+ Kh6 4.Kb7 a1Q 5.Rg4 Rb1 6.Rbb4 Rxb4+ 7.Rxb4 Kg5 8.Kb6 Qf6+ 9.Kb5 Kf5 -+ (-4.45) Depth: 12/27 00:00:16 2040kN, tb=2562 1.Re5+ Kf6 2.Rf5+ Kg6 3.Rg5+ Kh6 4.Ra5 a1Q 5.Rge5 Qb1 6.Rab5 Qa2+ 7.Ra5 Qb2 8.Reb5 Qg2+ 9.Ka7 Kg7 -+ (-4.51) Depth: 13/30 00:00:59 10323kN, tb=9543 1.Re5+ Kf6 2.Rf5+ Kg6 3.Rg5+ Kh6 4.Ra5 a1Q 5.Rge5 Qb1 6.Rab5 Qa2+ 7.Ra5 Qb2 8.Reb5 Qg2+ 9.Ka7 Kg7 -+ (-4.11) Depth: 14/34 00:01:14 12784kN, tb=15185 1.Re5+ Kd6 2.Rbd5+ Kc6 3.Rc5+ Kb6 4.Rb5+ Ka6 5.Ra5+ Kb6 6.Reb5+ Kc6 7.Rxa2 = (0.00) Depth: 14/34 00:01:19 13746kN, tb=17132 1.Re5+ Kd6 2.Rbd5+ Kc6 3.Rc5+ Kb6 4.Rb5+ Ka6 5.Ra5+ Kb6 6.Reb5+ Kc6 7.Rxa2 = (0.00) Depth: 15/35 00:01:27 14952kN, tb=20865 1.Re5+ Kd6 2.Rbd5+ Kc6 3.Rc5+ Kb6 4.Rb5+ Ka6 5.Ra5+ Kb6 6.Reb5+ Kc6 7.Rxa2 = (0.00) Depth: 16/36 00:01:41 17319kN, tb=25739 1.Re5+ Kd6 2.Rbd5+ Kc6 3.Rc5+ Kb6 4.Rb5+ Ka6 5.Ra5+ Kb6 6.Reb5+ Kc6 7.Rxa2 = (0.00) Depth: 17/38 00:02:07 21621kN, tb=37589 1.Re5+ Kd6 2.Rbd5+ Kc6 3.Rc5+ Kb6 4.Rb5+ Ka6 5.Ra5+ Kb6 6.Reb5+ Kc6 7.Rxa2 = (0.00) Depth: 18/40 00:02:58 29953kN, tb=56663 1.Re5+ Kd6 2.Rbd5+ Kc6 3.Rc5+ Kb6 4.Rb5+ Ka6 5.Ra5+ Kb6 6.Reb5+ Kc6 7.Rxa2 = (0.00) Depth: 19/42 00:04:25 45080kN, tb=103072 1.Re5+ Kd6 2.Rbd5+ Kc6 3.Rc5+ Kb6 4.Rb5+ Ka6 5.Ra5+ Kb6 6.Reb5+ Kc6 7.Rxa2 = (0.00) Depth: 20/44 00:06:56 75061kN, tb=166647 1.Re5+ Kd6 2.Rbd5+ Kc6 3.Rc5+ Kb6 4.Rb5+ Ka6 5.Ra5+ Kb6 6.Reb5+ Kc6 7.Rxa2 = (0.00) Depth: 21/46 00:11:59 140725kN, tb=334471 (Taylor, Notts 31.07.2000) After nearly 12 mins on an AMD 500 128 meg of ram......... Chris Taylor..
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