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Subject: Re: Test your programs for a #18

Author: Dieter Buerssner

Date: 11:39:56 05/24/05

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On May 24, 2005 at 14:20:04, Volker Kniest wrote:

>Hi folks,
>
>which engine find the keymove 1.Ke8 and the mate in 18?
>
>3K4/7P/7k/1R5P/1B6/8/p7/b7 w - - 0 1
>
>FEN: 3K4/7P/7k/1R5P/1B6/8/p7/b7 w - - 0 1
>
>I like to see the pv including time for solution from different engines.

Yace, Centrino, 1.7 GHz, 3/4/5 men TBs, bitbases, 600 MB hash, TB probing set to
aggressive (tb_u 4 in conosóle/WB mode) shows mate in 19 in 1:37 and mate in 18
after 4 minutes with a nice PV.

   7613237  57.603   5.57 11.  1.Ke8 Bf6 2.h8=Q+ Bxh8 3.Bf8+ Kh7 4.Rb7+ Kg8
                               5.h6 Bd4 6.Bg7 Be3 7.Be5 Bxh6 8.Ra7 Bd2 9.Rxa2
                               {500}
   7662347  57.903   5.97 12++ 1.Ke8 Bf6 2.h8=Q+ Bxh8 3.Bf8+ Kh7 4.Rb7+ Kg8
                               5.h6 Bd4 6.Bg7 Be3 7.Be5 Bd4 8.Bxd4 a1=N
   7684149  58.043   6.97 12++ 1.Ke8 Bf6 2.h8=Q+ Bxh8 3.Bf8+ Kh7 4.Rb7+ Kg8
                               5.h6 Bd4 6.Bg7 Be3 7.Be5 Bd4 8.Bxd4 a1=N
   7907964  59.425  11.97 12++ 1.Ke8 Bf6 2.h8=Q+ Bxh8 3.Bf8+ Kh7 4.Rb7+ Kg8
                               5.h6 Bb2 6.Bg7 Kh7 7.Bxb2+ Kg6 8.h7 a1=R 9.h8=Q
                               Kf5 {1351}
  13295847  1:37.6  Mat19 12t  1.Ke8 Kxh7 2.Ra5 Bf6 3.Rxa2H Kg8H 4.h6H {HT}
  21906101  2:47.3  Mat19 12.  1.Ke8 Kxh7 2.Ra5 Bf6 3.Rxa2 Kg8 4.h6
  34582643  4:01.1  Mat18 13t  1.Ke8 Bf6 2.h8=Q+ Bxh8 3.Bf8+ Kh7 4.Rb7+ Kg8
                               5.h6 Bb2 6.Bg7H a1=QH 7.h7+H Kxh7H 8.Bxb2+H
                               {EGTB} 8...Kg6! 9.Bxa1! Kf5! 10.Rb4! Ke6!
                               11.Rd4 Kf6 12.Kd7! Kf5 13.Rc4 Kg6! 14.Ke7 Kg5
                               15.Ke6! Kg6 16.Bf6! Kh6 17.Kf7! Kh7 18.Rh4#!
                               {850}
  55218195  7:04.2  Mat18 13.  1.Ke8 Bf6 2.h8=Q+ Bxh8 3.Bf8+ Kh7 4.Rb7+ Kg8
                               5.h6 Bb2 6.Bg7 a1=Q 7.h7+ Kxh7 8.Bxb2+ {EGTB}
                               8...Kg6! 9.Bxa1! Kf5! 10.Rb4! Ke6! 11.Rd4 Kf6
                               12.Kd7! Kf5 13.Rc4 Kg6! 14.Ke7 Kg5 15.Ke6! Kg6
                               16.Bf6! Kh6 17.Kf7! Kh7 18.Rh4#! {850}

For normal games, setting TB probing to aggressive is probably a bad idea. To
find a forced mate in endgame positions, it is often a good idea. It would
easily win the position with default settings, but probably need much longer to
show the mate.

Regards,
Dieter

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