Author: Robert Hyatt
Date: 07:14:37 11/13/00
Go up one level in this thread
On November 13, 2000 at 09:18:41, Ricardo Gibert wrote: >On November 12, 2000 at 21:23:54, Robert Hyatt wrote: > >>On November 12, 2000 at 21:17:53, Howard Exner wrote: >> >>>On November 12, 2000 at 18:41:13, Ricardo Gibert wrote: >>> >>>>Here is an endgame study that I think everybody will find entertaining: >>>>[D]8/1p6/1p6/2k4P/7P/5ppK/7P/8 w - - 0 0 >>>> >>>>Fritz4 is hopeless in solving this position. I was wondering if newer engines >>>>with 5-man EGTBs would stand a better chance of solving it. >>>> >>>>Hint: White Queens all three of his pawns. >>> >>>This is what Tiger 13 produces when given 5 seconds per side using an Athlon >>>900. >>> >>>1.Kxg3 Kd4 2.h6 Ke3 3.h7 f2 4.h8Q f1Q 5.Qe5+ Kd2 6.Qd4+ Kc2 7.Qf2+ Qxf2+ 8.Kxf2 >>>b5 9.h5 b4 10.h6 b3 11.h7 b2 12.h8Q b1Q 13.Qh7+ Kc1 14.Qxb1+ Kxb1 15.h4 1-0 >>> >>>Is this on the right track? >> >> >>Here is crafty's analysis from the starting position: >> >> 19-> 28.40 6.49 1. Kxg3 Kd4 2. h6 Ke3 3. h7 f2 4. h8=Q >> f1=Q 5. Qe5+ Kd2 6. Qd4+ Kc2 7. Qf2+ >> Qxf2+ 8. Kxf2 b5 9. h5 b4 10. h6 b3 >> 11. h7 b2 12. h8=Q b1=R 13. Qh7+ Kc1 >> 14. Qxb1+ Kxb1 15. Ke3 Ka2 <HT> > > >1.Kxg3 Kd4 2.h6 Ke3 3.h7 f2 4.h8Q f1Q 5.Qe5+ Kd2 6.Qd4+! > >[Congratualations on finding a cook! This study appears to have 2 solutions >unless I'm missing something subtle. The one given by Kashdan follows: 6.Qf4+ >Qxf4+ 7.Kxf4 b5 8.h5 b4 9.h6 b3 10.h7 b2 11.h8Q b1Q 12.Qd4+ Ke2 13.Qe4+ Qxe4+ >14.Kxe4 b5 15.h4 Kd2 16.Kd4 Kc2 17.Kc5 Kc3 18.h5 (18.Kxb5? Kd4=) 18...b4 19.h6 >b3 20.h7 b2 21.h8Q+ wins] > >6...Kc2 7.Qf2+ Qxf2+ 8.Kxf2 b5 9.h5 b4 10.h6 b3 11.h7 b2 12.h8Q b1Q 13.Qh7+ Kc1 >14.Qxb1+ Kxb1 15.Ke3? > >[But here Crafty goes astray. Better is 15.h4 b5 16.h5 b4 17.h6 b3 18.h7 b2 >19.h8Q wins] > >15...Ka2? > >[Black draws with 15...b5 16.Kd3 (16.Kd4 b4 17.Kc4 Kc2 18.Kxb4 Kd3=; 16.h4 b4 >17.h5 b3 18.h6 b2 19.h7 Kc2=) 16...Ka2 (16...b4 17.Kc4 Kc2 18.Kxb4 Kd3=) 17.Kc3 >Ka3 18.Kc2 Ka2 19.Kc3=] > >16.Kd4 Kb3 17.Kc5 Kc3 > >[Or 17...b5 18.Kxb5 Kc3 19.Kc5 Kd3 20.Kd5 Ke3 21.Ke5 Kf3 22.Kf5 wins] > >18.h4 b5 19.h5 b4 20.h6 b3 21.h7 b2 22.h8Q+ wins > > > >I don't trust computer evaluations like "6.49" in endings like this and I think >with good reason, since in this case Crafty led itself astray. Obviously with >EGTBs, this study would be no problem for Crafty, though I think it would then >have found the solution given by Kashdan instead, since a 5-man ending occurs >sooner there. Can you verify this for sure? It definitely used all the 3-4-5 piece ending files. The only comment I would make is that the farther you get from the root move in _any_ chess engine's PV, the less accurate that move is. IE you might find the first move in the PV to be correct, while the last move is ridiculous. That is because the last move is the result of a 0 ply search.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.