Author: Ricardo Gibert
Date: 01:14:42 07/31/00
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On July 31, 2000 at 04:02:06, Ricardo Gibert wrote: >On July 31, 2000 at 03:32:31, Ricardo Gibert wrote: > >>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 >> >>I think the basic idea may be something like this: >> >>1.Re5 Kf6 2.Ra5 a1Q 3.Rb5 Qd4 4.Rb6 Qxb6 5.Rf5 Ke7 6.Rf7 Kd8 7.Rf8 Kc7 8.Rf7 Kc8 >> 9.Rc7 >> >>I'm doing this from work (night shift), so I didn't have time to elaborate nor >>check my analysis. If it isn't right, maybe it will give you the ideas you need >>to figure it out for yourself. Good luck! > >Oops! 3...Rh8 improves. It looks like I have to push the K all the way over to >h6 after all: 2.Rf5 Kg6 3.Rg5 Kh6 4. Ra5 a1Q 5. Rb5 Qd4 (5...Qh8 6.Rb8) 6.Rb6 >Qxb6 7.Rh5 Kg7 8.Rh7 Kf8 9. Rh8 Ke7 10.Rh7 Kd8 (10...Kd6 is a real can of worms >I'll let you work out for now. I have to get back to work!) 11.Kc7 Rh7 12.Kc8 >Rc7 Aha! I think I've fixed it now. 10..Kd6 11.Rh6 Kc5 12.Rh5 Kc4 wins, but 9.Rf7 draws. Back to work again!
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