Author: Dieter Buerssner
Date: 12:22:24 12/07/03
Go up one level in this thread
On December 07, 2003 at 10:24:48, Uri Blass wrote:
[much snipped]
>On December 06, 2003 at 18:10:23, Dana Turnmire wrote:
>
>>> 4k3/5ppp/8/8/8/8/PPP5/3K4 w - -
>>>
>>>{The main variation is } 1. Ke2 Kd7 2. Kf3 Kc6 3. a4 h5 4. c4 f5 5. Kg3 Kb6 6.
>Can you give me a proof that white wins with 1.Ke2 and not with 1.a4?
I don't have any proof (yet?). Also, I think Dana did not say, that no other
moves than 1. Ke2 will win. I just studied the pos with some backward analysis
of Yace (I started from variations given by Dana). After Ke2 Kd7 Kf3 I get:
95112158 1:40.0 -4.04 21. 2...f5 3.Kf4 g6 4.a4 h6 5.a5 h5 6.Kg5 Kc6 7.c4
Kc7 8.b4 Kb8 9.c5 Kb7 10.b5 Kb8 11.c6 Kc7
12.Kxg6 h4 {-80}
96211359 1:41.5 -4.44 22-- 2...f5 3.Kf4 g6 4.a4 h6 5.a5 h5 6.Kg5 Kc6 7.c4
Kc7 8.c5 Kd8 9.b4 Ke8 10.b5 h4 11.Kxh4 Kd8H
12.a6H Kc7H 13.Kg5H Kc8H 14.Kxg6H {HT} {-160}
131949723 2:21.5 -4.95 22t 2...f5 3.Kf4 g6 4.a4 h6 5.a5 h5 6.Kg5 Kc6 7.c4
Kc7 8.c5 Kb8 9.b3 Kc8 10.a6 h4H 11.Kxh4H Kb8H
12.c6H g5+H 13.Kxg5H {HT} {-160}
267226972 5:08.0 -4.94 22t+ 2...Kc6 3.c4 Kc5 4.b4+ Kxb4 5.a4 Kxa4 6.c5 Ka5
7.c6 Ka6 8.Kg2 f5 9.Kh3 g6 10.Kg3 h5 11.Kf3 h4H
12.Ke2H g5H 13.Kd1H Ka7H {HT} {160}
314686997 6:00.7 -4.40 22t 2...Kc6 3.a4 g6 4.a5H {HT} {0}
314686997 6:00.7 -4.40 22. 2...Kc6 3.a4 g6 4.a5 {HT} {0}
393958788 7:48.2 -4.40 23t 2...Kc6 3.a4 g6 4.a5H {HT} {0}
PVs shown don't mean too much (I might have "teached" the engine, that more
obvious defences fail, already). Also, -4.4 is not a proof (mate score should
be). But I was too lazy, to get higher scores (but I think, it will be
possible). I am aware, that my engine can show -4.4 in drawn pawn endgames, but
in this position, I think the probability is very low. I have the engine now in
a state, where it easily should win after any defence after 1...Kd7. Feel free
to suggest one.
I used a version of my engine, that accesses the KPPKP TBs from RAM until the
deepest qsearch nodes. I think, this can be of some advantage in such an
analysis.
Regards,
Dieter
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