Author: Bernhard Bauer
Date: 06:35:29 03/01/00
Go up one level in this thread
On March 01, 2000 at 08:57:20, Martin wrote:
>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
Hallo Martin,
your analysis is much better than mine, which only showed an idea.
However, after your 8...Bg4 white is completely lost. I think your "-+" showes
that you are of the same opinion.
By "easy win" I mean no combination, nothing special, simply go to the queen
side, win the white bishop and queen a pawn. White my try to complicate, but
whithout any hope.
Crafty with modified extensions gives the following lines:
21-> 7:01 1.67 1. ... Kf5 2. c4 dxc4 3. d5 Bf1 4.
Kh2 Be2 5. d6 Ke6 6. f4 Bg4 7. Be5
c3 8. Bxc3 Kxd6 9. Kg3 Kd5 10. Ba1
Bf5 11. Kh2 Ke4
22 11:53 ++ 1. ... Kf5!!
22 18:48 2.50 1. ... Kf5 2. c4 dxc4 3. d5 Bh1 4.
d6 Ke6 5. Kxh3 Bxf3 6. Bh8 Kxd6 7.
Kg3 Be2 8. Kf4 Kd5 9. Bc3 Bd3 <HT>
22-> 20:38 2.50 1. ... Kf5 2. c4 dxc4 3. d5 Bh1 4.
d6 Ke6 5. Kxh3 Bxf3 6. Bh8 Kxd6 7.
Kg3 Be2 8. Kf4 Kd5 9. Bc3 Bd3 <HT>
So Crafty sees the loss after 1...Kf5 and gives a pawn by 2. c4
Kind regards
Bernhard
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