Author: Uri Blass
Date: 02:30:06 08/17/04
Go up one level in this thread
On August 16, 2004 at 19:56:43, Dieter Buerssner wrote:
>On August 16, 2004 at 15:20:06, Uri Blass wrote:
>
>>On August 16, 2004 at 14:48:51, martin fierz wrote:
>>
>>>On August 16, 2004 at 08:46:12, Vincent Lejeune wrote:
>>>
>>>>I found this position here http://www.fierz.ch/pontresina.htm , after I searched
>>>>10 min with no board and then 10 with a board and then 20 with chessengine, I
>>>>gave up ... is this position buggy ??
>>>>
>>>>pasting :
>>>>
>>>> A cool (and very instructive) position which occurred in round 5: black to move
>>>>and win! This one is harder than you think :-)
>>>>Click here for a hint!
>>>>The obvious 1... c4+ only draws. To win, you need to know something about
>>>>'corresponding squares'.
>>>>
>>>>[d]8/8/4p2p/1kp1P1p1/1p4P1/1P1K2P1/7P/8 b - - 0 1
>>>
>>>hi vincent,
>>>
>>>as far as i am aware, this position is quite correct. computers have trouble
>>>with it, that is true...
>>>
>>>cheers
>>> martin
>>
>>As far as I can see 20 minutes with chess engine and fast hardware should be
>>enough at least if you choose the right engine and the right hardware.
>>
>>Here is some analysis on A3000(512 mbytes hash)
>
>Seems, you did not use bitbases. With them, you should see a rather convincing
>score faster. On my slower hardware with the same engine:
>
> 151584039 2:35.1 2.83 19t 1...Kb6 2.Ke3 Kb7 3.Kd3 Kc7 4.Ke3 Kb6 5.Ke4 Kc6
> 6.h3H Kc7H 7.Kd3H Kb7H 8.Ke3H Kb6H 9.h4H Kb5H
> 10.Ke4H c4H 11.bxc4+H Kxc4H 12.Ke3H b3H 13.Kd2H
> Kb4H 14.Kd3H gxh4H 15.Ke3H Ka3H 16.Kd3H b2H
> 17.Ke2H b1=QH 18.g5H {HT}
> 157279773 2:42.0 2.84 19t+ 1...Ka5 2.Kd2 c4 3.bxc4 b3 4.Kc3 Ka4 5.Kb2 Kb4
> 6.c5 Kxc5 7.Kxb3 Kd4 8.Kc2 Ke4 9.Kd2 Kf3 10.Kd3
> Kxg4 11.Kd4 Kf5 12.Kd3 Kxe5 13.Kc2 Ke4 14.Kb1
> e5 15.Kb2 Kf3 16.Kb3 g4 17.Kc3 e4 18.Kb3 h5
> 19.Kc4 Kg2 20.Kd5 {80}
> 162510060 2:48.6 3.23 19++ 1...Ka5 2.Kd2 c4 3.bxc4 b3 4.Kc3 Ka4 5.Kb2 Kb4
> 6.c5 Kxc5 7.Kxb3 Kd4 8.Kc2 Ke4 9.Kd2 Kf3 10.Kd3
> Kxg4 11.Kd4 Kf5 12.Kc3 h5 13.Kb3 Kxe5 14.Kb2 h4
> 15.g4 Ke4 16.Kc3 Kf3 17.Kb3 h3 18.Kb2 e5 19.Ka1
> Kxg4 20.Kb2H Kf4H 21.Kc3H g4H 22.Kd3H {160}
> 169901780 2:57.8 4.23 19++ 1...Ka5 2.Kd2 c4 3.bxc4 b3 4.Kc3 Ka4 5.Kb2 Kb4
> 6.c5 Kxc5 7.Kxb3 Kd4 8.Kc2 Ke4 9.Kd2 Kf3 10.Kd3
> Kxg4 11.Kd4 h5 12.Kc5 Kf5 13.Kd6 g4 14.Kc6 Kxe5
> 15.Kc7 Kd5 16.Kd7 e5 17.Kd8 e4 18.Kc8 h4 19.Kb8
> hxg3 20.Kc7 {160}
> 177193974 3:06.3 4.32 19t 1...Ka5 2.Kd2 c4 3.bxc4 b3 4.Kc3 Ka4 5.Kb2 Kb4
> 6.c5 Kxc5 7.Kxb3 Kd4 8.Kc2 Ke4 9.Kc3 Kf3 10.Kc4
> Kxg4 11.Kc5H Kf5H 12.Kc4H h5H 13.Kb3H Kxe5H
> 14.Kc4H Ke4H 15.Kb4H Kf3H 16.Kc4H g4H 17.Kb3H
> {HT} {80}
> 211517211 3:45.2 4.32 19. 1...Ka5 2.Kd2 c4 3.bxc4 b3 4.Kc3 Ka4 5.Kb2 Kb4
> 6.c5 Kxc5 7.Kxb3 Kd4 8.Kc2 Ke4 9.Kc3 Kf3 10.Kc4
> Kxg4 11.Kc5 Kf5 12.Kc4 h5 13.Kb3 Kxe5 14.Kc4
> Ke4 15.Kb4 Kf3 16.Kc4 g4 17.Kb3 {HT} {80}
> 225676618 4:03.0 4.72 20++ 1...Ka5 2.Kd2 c4 3.bxc4 b3 4.Kc3 Ka4 5.Kb2 Kb4
> 6.c5 Kxc5 7.Kxb3 Kd4 8.Kc2 Ke4 9.Kc3 Kf3 10.Kb3
> Kxg4 11.Kc4 Kf5 12.Kb3 Kxe5 13.Kc2 Ke4 14.Kb1
> e5 15.Kc1H Kf3H 16.Kd2H Kf2H 17.Kc3H Ke3H
> 18.g4H e4H 19.Kc2H Ke2H 20.Kc1H e3H 21.h4H h5H
> 22.Kb2H Kf3H 23.Kc3H e2H 24.gxh5H e1=Q+H
> 25.Kd3H {921}
> 234413213 4:14.0 5.72 20++ 1...Ka5 2.Kd2 c4 3.bxc4 b3 4.Kc3 Ka4 5.Kb2 Kb4
> 6.c5 Kxc5 7.Kxb3 Kd4 8.Kc2 Ke4 9.Kc3 Kf3 10.Kb3
> Kxg4 11.Kc4 Kf5 12.Kc3 h5 13.Kb3 Kxe5 14.Kb4
> Ke4 15.Kc4 Kf3 16.Kd3 Kg2 17.Kc3 e5 18.Kb3 h4
> 19.g4 Kxh2 20.Kc2 Kg3 21.Kb1 {160}
> 312960488 5:51.7 8.40 20t 1...Ka5 2.Kd2 c4 3.bxc4 b3 4.Kc3 Ka4 5.Kb2 Kb4
> 6.c5 Kxc5 7.Kxb3 Kd4 8.Kc2 Ke4 9.Kc3 Kf3 10.Kc4
> Kxg4 11.Kc5 Kf5 12.Kd4 h5 13.Kc3H Kxe5H 14.Kc4H
> Ke4H 15.Kc5H Kf3H 16.Kc6H {HT} {80}
>
>compared to your
You are right
I believe that tablebases were not used in my analysis(as far as I know I did
not install them in the new hardware).
Uri
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