Author: Andreas Stabel
Date: 02:33:42 07/31/00
Go up one level in this thread
On July 31, 2000 at 04:14:42, Ricardo Gibert wrote:
>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!
Crafty finds the draw:
14-> 44.43 0.00 1. Re5+ Kd6 2. Rbd5+ Kc6 3. Rc5+ Kb6
4. Rb5+ Ka6 5. Ra5+ Kb6 6. Reb5+ Kc6
7. Rxa2 <EGTB>
Regards
Andreas Stabel
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