Author: Tony Werten
Date: 18:39:52 11/24/01
Go up one level in this thread
On November 24, 2001 at 13:50:46, Rafael Andrist wrote:
>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
>>
>>
>>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
XiniX suggested Bf3 as well with a winning advantage (+1.8) . It just took so
long on my AMD 333 that I stopped it after 50 minutes
Tony
>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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