Computer Chess Club Archives


Search

Terms

Messages

Subject: Re: one from the archives ...

Author: Dieter Buerssner

Date: 00:48:09 03/30/05

Go up one level in this thread


On March 29, 2005 at 22:48:13, Mike Byrne wrote:

>how before your engine realizes black is winning...
>
>Black(1): 1k6/8/8/8/8/5p1p/PPP5/6K1 w - - 0 1

Yace 3 s with TBs/bitbases. Without any TBs, 7s:

   2837131   2.750   1.35 11.  1.a4 Kc7 2.a5 Kb7 3.b4 Ka6 4.c4 Ka7 5.c5 Kb7
                               6.b5 Kb8 7.a6 Ka7 8.c6 Kb6 9.a7 Kxa7 10.c7 Kb7
                               11.b6 Kc8 12.Kf2 {0}
   3497051   3.390   0.95 12-- 1.a4 Kc7 2.a5 Kb7 3.b4 Ka6 4.c4 Ka7 5.b5 Kb7
                               6.a6+ Kb6 7.Kh2 f2 8.a7 f1=Q 9.a8=Q Qxc4 10.Kg3
                               {0}
   3969894   3.843  -0.05 12-- 1.a4 Kc7 2.a5 Kb7 3.b4 Ka6 4.c4 Ka7 5.b5 Kb7
                               6.a6+ Kb6 7.a7 Kxa7 8.c5 Kb8 9.c6 Kc7 10.b6+
                               Kxb6 11.Kh2 f2 12.c7H f1=QH 13.c8=QH {HT}
   4244316   4.109  -1.20 12t  1.a4 Kc7 2.a5 Kb7 3.b4 Ka6 4.c4 Ka7 5.b5 Kb7
                               6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.c7 Kxc7H 10.a7H
                               Kb7H 11.b6H Ka8H 12.Kh1H f2H 13.b7+H Kxb7H
                               14.a8=Q+H Kxa8H {-160}
   5333775   5.156  -1.20 12.  1.a4 Kc7 2.a5 Kb7 3.b4 Ka6 4.c4 Ka7 5.b5 Kb7
                               6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.c7 Kxc7 10.a7
                               Kb7 11.b6 Ka8 12.Kh1 f2 13.b7+ Kxb7 14.a8=Q+
                               Kxa8 {-160}
   5546280   5.390  -1.60 13-- 1.a4 Kc7 2.a5 Kb7 3.b4 Ka6 4.c3 Kb5 5.Kf2 h2
                               6.a6 h1=Q 7.a7 Qh2+ 8.Ke3 f2 9.a8=Q f1=Q 10.Kd4
                               {-841}
   5667635   5.515  -2.60 13-- 1.a4 Kc7 2.a5 Kb7 3.b4 Ka6 4.c3 Kb5 5.Kf2 h2
                               6.a6 h1=Q 7.a7 Qh2+ 8.Ke3 f2 9.a8=Q f1=Q 10.Kd4
                               {-841}
   6675144   6.515  -6.31 13t  1.a4 Kc7 2.a5 Kb7 3.b4 Ka6 4.c4 Ka7 5.b5 Kb7
                               6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.c7 Kxc7 10.a7
                               Kb7 11.b6 Ka8H 12.Kf2H h2H 13.Kxf3H h1=Q+H
                               14.Kf4H {-841}
   7389975   7.187  -6.31 13.  1.a4 Kc7 2.a5 Kb7 3.b4 Ka6 4.c4 Ka7 5.b5 Kb7
                               6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.c7 Kxc7 10.a7
                               Kb7 11.b6 Ka8 12.Kf2 h2 13.Kxf3 h1=Q+ 14.Kf4
                               {-841}

With aggressive TB probing, it shows a mate score after a while:

  33320007  3:56.0 -16.95 16.  1.a4 Kb7 2.b4 Ka7 3.a5 Ka6 4.c4 Ka7 5.b5 Kb7
                               6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.a7 Kxa7 10.c7
                               Kb7 11.b6 Kc8 12.Kf1 h2 13.Kf2 h1=Q 14.Ke3 f2
                               15.Kd4 Qd1+ 16.Ke5 f1=Q {-1842}
  36527323  4:24.8 -17.35 17-- 1.a4 Kb7 2.b4 Ka7 3.a5 Ka6 4.c4 Ka7 5.b5 Kb7
                               6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.a7 Kxa7 10.c7
                               Kb7 11.b6 Kc8 12.Kf2 h2 13.Ke3 f2 14.Kd4 f1=Q
                               15.Kc3 h1=Q 16.Kb3 Qb7 {-1842}
  44737232  5:43.3 -18.35 17-- 1.a4 Kb7 2.b4 Ka7 3.a5 Ka6 4.c4 Ka7 5.b5 Kb7
                               6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.Kf2 h2 10.Ke3 f2
                               11.a7 Kxa7 12.Kf4 Kb6 13.Kf5 h1=Q 14.Kg5 f1=Q
                               15.c7
  49472272  6:29.9 -23.35 17-- 1.a4 Kb7 2.b4 Ka7 3.a5 Ka6 4.c4 Ka7 5.b5 Kb7
                               6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.Kf2 h2 10.Ke3 f2
                               11.a7 Kxa7 12.Kf4 Kb6 13.Kf5 h1=Q 14.Kg5 f1=Q
                               15.c7
  64429771  9:55.1 -Mat26 17t  1.a4 Kb7 2.a5 Ka7 3.b3 Kb7 4.c4 Ka7H 5.c5H Kb8H
                               6.b4H Kb7H 7.b5H Kb8H 8.Kf2H h2H 9.Kg3H h1=QH
                               10.Kg4H f2H 11.b6H Qd5H 12.a6H Qf5+H 13.Kxf5H
                               f1=Q+H 14.Ke6H Qxa6H {EGTB} 15.Kf6 Qa5 16.Kf5
                               Qxc5+ 17.Kf4 Qd5 18.b7 Qd3 19.Kg4 Kxb7! 20.Kg5
                               Qf3 21.Kg6 Kc7 22.Kh6 Qg3 23.Kh7 Kd7 24.Kh8 Ke7
                               25.Kh7 Kf7 26.Kh8 Qh3# {-1001}
 168086253 33:20.5 -Mat26 17.  1.a4 Kb7 2.a5 Ka7 3.b3 Kb7 4.c4 Ka7 5.c5 Kb8
                               6.b4 Kb7 7.b5 Kb8 8.Kf2 h2 9.Kg3 h1=Q 10.Kg4 f2
                               11.b6 Qd5 12.a6 Qf5+ 13.Kxf5 f1=Q+ 14.Ke6 Qxa6
                               {EGTB} 15.Kf6 Qa5 16.Kf5 Qxc5+ 17.Kf4 Qd5 18.b7
                               Qd3 19.Kg4 Kxb7! 20.Kg5 Qf3 21.Kg6 Kc7 22.Kh6
                               Qg3 23.Kh7 Kd7 24.Kh8 Ke7 25.Kh7 Kf7 26.Kh8
                               Qh3# {-1001}
[...]

 311180827 53:09.5 -Mat26 22.  1.a4 Kb7 2.a5 Ka7 3.b3 Kb7 4.c4 Ka7 5.c5 Kb8
                               6.b4 Kb7 7.b5 Kb8 8.a6 Ka7 9.c6 Kb6 10.c7 Kxc7
                               11.a7 Kb7 12.b6 Ka8 13.Kh2 f2 14.Kxh3 {EGTB}
                               14...f1=Q+! 15.Kg3 Qg1+ 16.Kf3 Qxb6! 17.Kf4 Qe6
                               18.Kf3 Qf5+ 19.Kg3 Kxa7! 20.Kg2 Kb6! 21.Kh2 Qg5
                               22.Kh3 Kc6 23.Kh2 Kd5! 24.Kh3 Ke4! 25.Kh2 Kf3!
                               26.Kh3 Qh5# {-1001}

Regards,
Dieter




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.