Author: Ricardo Gibert
Date: 02:46:39 07/31/00
Go up one level in this thread
On July 31, 2000 at 05:33:42, Andreas Stabel wrote: >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 It seems to, but unfortunately the PV it gives is not very enlightning. 1...Kf6 is the critical line. After 1...Kd6, could analysis should stop right then and there with obvious draw. Feed the position after 1.Re5 Kf6 2.Rf5 Kg6 3.Rg5 Kh6 to crafty and see what it says.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.