Author: Joachim Rang
Date: 02:50:11 04/25/05
Go up one level in this thread
On April 24, 2005 at 21:46:00, John Merlino wrote:
>On April 24, 2005 at 21:07:45, pavel wrote:
>
>>[D]1b6/4P3/1P2PN2/8/8/P1k5/P1p2P2/K5B1 w
>>
>>http://www.edcollins.com/chess/under-promote.htm
>>
>>Any program find the checkmate?
>>
>>pavs
>
>Checkmate is a VERY long way away from the initial position -- maybe as many as
>30 moves. That's a bit too far for an engine to see.
>
>However, there MIGHT be an error in this puzzle. The answer that is given is:
>
>[Event ""]
>[Site ""]
>[Date "2005.4.24"]
>[Round ""]
>[White "Merlin"]
>[Black "Merlin"]
>[TimeControl "-"]
>[Result "*"]
>[Setup "1"]
>[FEN "1b6/4P3/1P2PN2/8/8/P1k5/P1p2P2/K5B1 w - - 0 1"]
>
>1.Ne4+ Kd3 2.Nc5+ Kc3 3.Nb3 Be5 4.f4 Bf6 5.e8=N Bh8 6.f5 Be5 7.Bh2 Bxh2
>8.b7 Be5 9.b8=B Bxb8 10.Nc7 Bxc7 11.e7 Be5 12.e8=R Bf6 13.Re6 Bg7 14.f6
>
>and White wins.
>
>But it seems that 8...Kd3 9.Nc1+ Kd2 10.Kb2 Be5+ 11.Kb3 Kxc1 12.Nc7 Bxc7 13.e7
>Kd2 14.e8=Q c1=Q might hold for Black. Here's the position after my line:
>
>[D]4Q3/1Pb5/8/5P2/8/PK6/P2k4/2q5 w - - 0 15
>
>It would take a lot of analysis, much more than I'm willing to commit to it. :-)
>
>jm
Although your line is definitely an improvment for black I don't think that it
holds the position. After 2 minutes Shredder gives here already +5 and the eval
is climbing.
4Q3/1Pb5/8/5P2/8/PK6/P2k4/2q5 w - -
Engine: Shredder 9 UCI (128 MB)
von Stefan Meyer-Kahlen
10/28 0:01 +3.94 15.Dd7+ (407.698) 357
11/32 0:02 +3.94 15.Dd7+ (841.719) 332
12/33 0:04 +3.94 15.Dd7+ (1.550.156) 335
13/37 0:10 +3.94 15.Dd7+ Ke3 16.Dd5 Kf4 17.f6 Db1+
18.Ka4 Db6 19.f7 Da6+ 20.Kb3 Db6+
21.Kc2 (3.608.473) 334
14/40 0:27 +4.19++ 15.Dd7+ Ke3 (8.645.204) 318
14/40 0:45 +4.68 15.Dd7+ Ke3 16.Dd5 Lf4 17.f6 Dc7
18.f7 Db6+ 19.Kc4 Da6+ 20.Kc5 Da5+
21.Kc6 Dc7+ 22.Kb5 Ld6 23.De6+ Kd2 (14.816.689) 325
15/40 1:29 +4.93++ 15.Dd7+ Ke3 (27.845.916) 311
15/42 2:00 +5.43++ 15.Dd7+ Ke3 (38.646.693) 321
15/42 2:52 +5.58 15.Dd7+ Ke3 16.Dd5 Kf4 17.f6 De3+
18.Kc2 Db6 19.a4 (56.024.918) 325
16/44 4:59 +5.36 15.Dd7+ Ke3 16.Dd5 Lf4 17.f6 Dc7
18.f7 Ld6 19.a4 Lc5 20.a5 Kf4
21.Dc4+ Ke3 22.De6+ Kd4 23.Dg4+ Ke3 (102.021.801) 340
regards Joachim
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