Author: John Merlino
Date: 10:38:09 04/25/05
Go up one level in this thread
On April 25, 2005 at 05:50:11, Joachim Rang wrote: >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 Here's what CMX-Yoda v25 on a P4-2.4 has to say. Definitely not as convincing, as the increase in eval is much less pronounced than with Shredder. I have no idea which engine is more correct: Time Depth Score Positions Moves 0:00 1/4 1.68 7289 1.Qd7+ Ke3 2.Qd5 Qb1+ 3.Ka4 Qb6 0:00 1/5 1.87 24967 1.Qd7+ Ke3 2.Qd5 Kf4 3.f6 Be5 0:00 1/6 2.15 83938 1.Qd7+ Ke3 2.Qd5 Bb8 3.f6 Qb1+ 4.Ka4 Qb6 0:00 2/7 1.88 138373 1.Qd7+ Ke3 2.Qd5 Kf4 3.f6 Qe3+ 4.Kc2 Be5 5.f7 Qc3+ 6.Kd1 0:01 2/8 2.10 307568 1.Qd7+ Ke3 2.Qd5 Kf4 3.f6 Qb1+ 4.Ka4 Qb6 5.f7 Bd6 6.Qd3 0:05 2/9 2.21 993630 1.Qd7+ Ke3 2.Qd5 Kf4 3.f6 Qe3+ 4.Kc4 Qxa3 5.Qd2+ Kf3 6.Qd3+ Qxd3+ 7.Kxd3 Bd6 0:18 3/10 2.34 3286945 1.Qd7+ Ke3 2.Qd5 Bb8 3.f6 Qb1+ 4.Ka4 Qf1 5.f7 Qa6+ 6.Kb3 Qb6+ 7.Kc2 Qg6+ 8.Kc1 Qf6 0:28 3/11 2.33 5128850 1.Qd7+ Ke3 2.Qd5 Bb8 3.f6 Qb1+ 4.Ka4 Qf1 5.f7 Qa6+ 6.Kb3 Qb6+ 7.Kc2 Qg6+ 8.Kc1 Qf6 9.Qc5+ Kd3 1:00 3/12 2.34 11377557 1.Qd7+ Ke3 2.Qd5 Bf4 3.Kb4 Qe1+ 4.Kb5 Kf2 5.Qd4+ Kf3 6.Qxf4+ Kxf4 7.b8=Q+ Kxf5 8.Qc8+ Kg6 9.Qc6+ Kf5 10.a4 1:56 4/13 2.41 22724932 1.Qd7+ Ke3 2.Qd5 Bf4 3.a4 Qb1+ 4.Ka3 Kf2 5.a5 Bb8 6.a6 Qb6 7.Qd2+ Kf3 8.Qd3+ Kf4 9.Ka4 Kg5 4:22 5/14 2.59 53247445 1.Qd7+ Ke3 2.Qd5 Bf4 3.f6 Qb1+ 4.Ka4 Qg6 5.f7 Qa6+ 6.Kb3 Qb6+ 7.Kc4 Qa6+ 8.Kc5 Qf6 9.Kb5 Bd6 10.Qb3+ Kf2 11.Ka6 10:50 6/15 2.78 134839777 1.Qd7+ Ke3 2.Qd5 Bf4 3.f6 Qb1+ 4.Ka4 Qg6 5.f7 Qa6+ 6.Kb3 Qb6+ 7.Kc4 Qa6+ 8.Kc5 Qa5+ 9.Kc6 Qc7+ 10.Kb5 Bd6 11.Qc6 Qxf7 12.Qxd6 Qxb7+ 13.Qb6+ Qxb6+ 14.Kxb6 jm
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