Author: Martin
Date: 05:57:20 03/01/00
Go up one level in this thread
On March 01, 2000 at 03:42:23, Bernhard Bauer wrote: >On March 01, 2000 at 02:58:49, Dann Corbit wrote: > >>On March 01, 2000 at 01:37:17, Janos Keinrath wrote: >> >>>Hi! >>> >>>Yesterday I saw an intresting endgame position on ICC. >>> >>>[D]8/8/6k1/3p4/3P4/2P2PKp/pB4b1/8 b - - >>> >>>This is the final position of a blitz game played by Amateur >>>with black. The game ended with rep. draw, but I feel black somehow >>>can win. Could you check the position? What is the winning plan? >> >>Crafty likes Kf5 from the get-go, but the evaluation does not climb over one >>pawn until ply 19. I'd be surprised if programs see a win at normal game-type >>time controls (other than 'postal' games). > >This position is a simple win for black. >For example: >1... Kf5 >2.Ba1 Bf1 >3.Bb2 Be2 >4.Ba1 h2 >5.Kxh2 Kf4 >5.Kg2 Bxf3 >6.Kf2 Ke4 >7.Ke1 Kd3 >and black wins the white bishop and the game. >White may defend in a different way, but without any hope. >A human will win this position easyly. > >Crafty does very poor on this kind of positions. So it's output here >is not very usefull. >Look at H. Exner's pawn endgame test, pos12 >8/6Bp/6p1/2k1p3/4PPP1/1pb4P/8/2K5 b - - bm b2; >or on the famous position from Topalov-Shirov >8/8/4kpp1/3p1b2/p6P/2B5/6P1/6K1 b - - 0 47 > >Kind regards >Bernhard I don't think that this is an easy win. The defensive idea of white is to make use of his d-pawn in order to gain time to get his king back (after taking the black h-pawn). There are enough traps for black... 1...Kf5 2.c4 (of course) 2...dxc4 3.d5 Bf1 [3...Bh1? (intends h2) 4.Bc3 h2 5.Kxh2 Bxf3 6.Kg3 Bxd5 7.Kf2 Ke4 8.Ke2 Bc6 9.Kd2= just in time; 3...Kg6? with the idea to keep the h-pawn and to grab the white d-pawn first 4.Bc3 Kf7 5.f4 Ke7 6.f5 Kd6 7.f6 Bxd5 (7...Bf1 8.Kh2 Be2 9.Kxh3 Bh5 10.Kg3 Kxd5 11.Kf4=) 8.Kxh3 Kc5 9.Kg4 Kb5 10.Kf4 Ka4 11.Ke3 Kb3 12.Kd2= is just in time again] 4.Bc3 Be2 5.Kxh3 Kf4 [5...Bxf3? 6.Kg3 Bxd5 7.Kf2 Ke4 8.Ke2=] 6.Kg2 [6.d6? Bxf3 7.d7 (7.Bd2+ Kf5) 7...Bg4+ 8.Kg2 Bxd7 9.Kf2 Bg4-+] 6...Ke3 [6...Bxf3+? 7.Kf2 Bg4 8.d6 Ke4 9.d7 Bxd7 10.Ke2=] 7.d6 Bxf3+ 8.Kf1 Bg4 -+. Martin
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