Author: Rafael Andrist
Date: 10:50:46 11/24/01
Go up one level in this thread
On November 24, 2001 at 10:36:55, Günther Simon wrote:
>This position could have been arisen from one of my tournament games
>of last season. I suppose that it is only a draw. (note that W has
>a breakthrough motiv f5! followed by e6 and then the g-pawn becomes
>a dangerous outside passer...)
>I didnt spent much time with progs in this position by now but it seems
>that they differ very much here in favour of B.
>Eventually there is a win hidden deep inside (with some Zugzwang?!)?
>
>Günther
>
>
>[D] 8/1b2kp2/4p3/2K1P1P1/5P2/8/2P5/8 b - - 0 1
The black king can go to f5 an attack the white pawns. If the bishop rests on
the h1-a8 diagonal, White gets in a Zugzwang position and loses the pawns on the
king side. I don't see any resources of White to avoid this.
I let also run Yace (by Dieter Buerssner) run for about an hour and the score
indicates that White has to give at least one pawn:
20149818 1:40.1 1.27 15. 1...Ba6 2.Kb6 Bf1 3.Kc5 Kf8 4.Kd4 Kg7 5.Ke3 Kg6
6.Ke4 Ba6 7.c3 Bb7+ 8.Kd4
22299376 1:53.7 1.24 16t 1...Ba6 2.Kb6 Bf1 3.Kc5 Kf8 4.Kd4 Kg7 5.Ke3 Ba6
6.Kf3 Kg6 7.Kg4 Be2+ 8.Kh4 Kf5 9.Kg3 {190}
34140427 2:59.5 1.24 16. 1...Ba6 2.Kb6 Bf1 3.Kc5 Kf8 4.Kd4 Kg7 5.Ke3 Ba6
6.Kf3 Kg6 7.Kg4 Be2+ 8.Kh4 Kf5 9.Kg3 {190}
37021191 3:17.7 1.28 17t 1...Ba6 2.Kb6 Bf1 3.Kc5 Kf8 4.Kd4 Kg7 5.Ke3 Bg2
6.Kd3 Bf3 7.c4 Bb7 8.Ke2 Ba6 9.Kd3H {HT}
50830575 4:38.0 1.29 17t+ 1...Be4 2.c4 Kd7 3.Kb6 Bh1 4.Kb5 Bb7H 5.Kb6H
Bc6H 6.Ka6H Kc7H 7.Ka7H Bb7H 8.f5H Be4H 9.fxe6H
fxe6H 10.Ka6H Kc6H {HT} {190}
56959399 5:07.8 1.61 17t 1...Be4 2.c3 Bg2 3.Kb5 Kf8 4.c4 Kg7 5.c5 Kg6
6.c6 Kf5H 7.c7H Bb7H 8.Kc5H Kxf4H 9.Kb6H Bc8H
10.g6H {270}
68003398 6:04.5 1.62 17t+ 1...Bf3 2.Kb6 Bd1 3.c4 Kd7 4.Kc5 Kc7 5.Kb5 Bh5
6.g6 fxg6H 7.c5H {HT}
70673835 6:23.2 1.64 17++ 1...Bf3 2.Kb6 Bd1 3.c3 Be2 4.Kc5 Kf8 5.Kd4 Kg7
6.Ke3 Bc4 7.Kf2 Kg6 8.Ke3 Ba6 9.Kd4 Be2 10.Ke4H
{HT}
70935791 6:24.4 1.64 17t 1...Bf3 2.Kb6 Bd1 3.c3H Be2H 4.Kc5H Kf8H 5.Kd4H
Kg7H 6.Ke3H Bc4H 7.Kf2H Bd5H 8.Ke3H Kf8H 9.Kd4H
Bg2H 10.Ke3H Bh1H 11.c4H Ke7H 12.c5H Bc6H
13.Kd4H Kd7H 14.Ke3H Bb7H 15.g6H fxg6H 16.Kd4H
{HT}
78433232 7:08.9 1.64 17. 1...Bf3 2.Kb6 Bd1 3.c3 Be2 4.Kc5 Kf8 5.Kd4 Kg7
6.Ke3 Bc4 7.Kf2 Bd5 8.Ke3 Kf8 9.Kd4 Bg2 10.Ke3
Bh1 11.c4 Ke7 12.c5 Bc6 13.Kd4 Kd7 14.Ke3 Bb7
15.g6 fxg6 16.Kd4
99884071 9:17.0 1.69 18t 1...Bf3 2.Kb6 Be2 3.Kc5 Kf8 4.Kd4 Kg7 5.Ke3 Bb5
6.Kf2 Kg6 {HT} {190}
107386650 10:07.3 1.70 18t+ 1...Be4 2.c3 Kf8 3.c4 Bd3 4.Kd4 Bf1 5.Kc3 Bg2
6.c5 Ke7 7.Kc4 Kd7 8.Kd4
113900409 10:46.2 1.70 18t 1...Be4 2.c3 Kf8 3.c4H Bd3H 4.Kd4H Bf1H 5.c5H
Bg2H 6.Ke3H Bc6H 7.Kf2H Bd5H 8.Ke3H Bg2H 9.Kf2H
{HT} {190}
123809216 12:07.5 1.71 18t+ 1...Ba6 2.Kb6 Bf1 3.Kc5 Kf8 4.Kd4 Kg7 5.Ke3 Bg2
6.Kd3 Kg6 7.c4
137510003 13:39.2 1.84 18t 1...Ba6 2.Kb6 Bf1 3.Kc5 Kf8 4.Kd4 Kg7 5.Ke3 Kg6
6.Ke4 Bg2+ 7.Ke3 Kf5 8.c4 Be4 {HT} {190}
164940547 16:32.7 1.84 18. 1...Ba6 2.Kb6 Bf1 3.Kc5 Kf8 4.Kd4 Kg7 5.Ke3 Kg6
6.Ke4 Bg2+ 7.Ke3 Kf5 8.c4 Be4 9.c5H {190}
188871491 19:01.5 1.87 19t 1...Ba6 2.Kb6 Be2 3.Kc5 Kf8 4.Kd4 Kg7 5.Ke3 Bb5
6.Kd4 Kg6 7.Ke4 Ba6H 8.Ke3H Kf5H 9.Kf3H {HT}
{190}
285584454 31:44.7 1.87 19. 1...Ba6 2.Kb6 Be2 3.Kc5 Kf8 4.Kd4 Kg7 5.Ke3 Bb5
6.Kd4 Kg6 7.Ke4 Ba6 8.Ke3 Kf5 9.Kf3 {HT} {190}
352463663 39:35.7 1.88 20t 1...Ba6 2.Kb6 Be2 3.Kc5 Kd7 4.c3 Kc7 5.c4 Bf3
6.Kb5 Be4 7.Kc5 Bb7 8.f5H exf5H {HT} {270}
360685014 40:50.3 1.89 20t+ 1...Be4 2.c3
491332759 54:18.1 2.19 20t 1...Be4 2.c3 Kd7 3.c4 Kc7 4.Kd4 Bc6 5.Kc5 Bd7
6.Kd4 Kc6 7.c5 Bc8 8.Kd3 Ba6+ 9.Kc3 Kxc5 {HT}
{270}
519006204 56:54.5 2.20 20t+ 1...Bf3 2.Kb6 Kd7 3.Kc5 Kc7 4.c3 Bc6 5.Kb4 Kb6
6.Kb3 Kc5 7.Kc2 Kd5 8.g6 fxg6 9.Kd3 Bd7 10.Kd2
{HT} {270}
566961466 1:00:57 2.20 20t 1...Bf3 2.Kb6 Kd7 3.Kc5H Kc7H 4.c3H Bc6H 5.Kb4H
Kb6H 6.Kb3H {HT}
741126033 1:16:53 2.20 20. 1...Bf3 2.Kb6 Kd7 3.Kc5 Kc7 4.c3 Bc6 5.Kb4 Kb6
6.Kb3
stop
747929507 1:17:22 2.20 20f. 1...Bf3 2.Kb6 Kd7 3.Kc5 Kc7 4.c3 Bc6 5.Kb4 Kb6
6.Kb3
747929507 Nodes, 5.12% Leavenodes, 161119 Nodes/sec
201183031 eval, 77.51% score, 3446546285 genmoves, 1.39% captures le 699/240
ext: pawn 16952390, rcp 3071483, chk 17831, repchk 249877, null 40391, prune 795
833
htable: 398761473 store, 206 rejected, 747077601 probe, 59.2% f/p, 110.8% f/s
entries 1999998 age 1 renew 0
egtb probes 1439840, found 1137074 max_depth 38
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