Author: Heiner Marxen
Date: 07:43:33 12/25/00
Go up one level in this thread
On December 25, 2000 at 07:13:44, Uri Blass wrote:
>On December 24, 2000 at 18:01:44, Fernando Villegas wrote:
>1.Qa3 Kd8 2.Qa8+ Kc7 3.Qa7+ Kc8 4.Qa6+ Kb8 5.Qb6+ Kc8(Ka8 is a blunder and white
>wins by Kd7)
>
>I think that the position after 5...Ka8 is a good test position for chess
>programs.
>
>How much time does your engine need to find Kd7?
>
>
>[D]k7/8/1Q1pKp2/2pPPPp1/2pPPPp1/1pnrqrnp/4b3/4b3 w - - 0 1
>
>Uri
That is not hard. Cited from Chest output:
CHEST version 3.20, 14-May-2000
Options = -SLU
W: Ke6 Qb6 Pd4 Pd5 Pe4 Pe5 Pf4 Pf5 (8)
B: Ka8 Qe3 Rd3 Rf3 Be2 Be1 Nc3 Ng3 Pb3 Pc5 Pc4 Pd6 Pf6 Pg5 Pg4 Ph3 (16)
FEN: k7/8/1Q1pKp2/2pPPPp1/2pPPPp1/1pnrqrnp/4b3/4b3 w - -
analysing (mate in 8 moves):
Solution (in 6 moves):
Ke6 - d7
Kd7 Nxd5 exd5 Qxe5 fxe5 Ba5 Qa6+ Kb8 Kc6 =*= Qb7#
Bf2 Kc7 =*= Qb8#
Rc3 Kc7 =*= Qb8#
Rd2 Kc7 =*= Qb8#
b2 Kc7 Ba5 Qxa5#
Rb3 Qa6#
b1=Q Qa6#
b1=R Qa6#
-*- Qb8#
c3 Kc7 =*= Qb8#
-*- Kc7 Ba5 Qxa5#
-*- Qb8#
Ba5 Qa6+ Kb8 Kc6 =*= Qb7#
Bf2 Kc7 =*= Qb8#
Qd2 Kc8 Qb4 Qa6#
-*- Qb8#
Rc3 Kc7 =*= Qb8#
Rd2 Kc7 =*= Qb8#
b2 Kc7 Ba5 Qxa5#
Rb3 Qa6#
b1=Q Qa6#
b1=R Qa6#
-*- Qb8#
c3 Kc7 =*= Qb8#
-*- Kc7 Ba5 Qxa5#
-*- Qb8#
Nb5 Qc6+ Kb8 Qxb5+ Ka7 Kc7 Ba5+ Qxa5#
Ka8 Qb8#
-*- Qb7#
Ka8 Kc7 Ba5+ Qxa5#
Ka7 Qb7#
-*- Qb8#
Ka7 Kc8 =*= Qb7#
Qxe4 Kc8 Qxf5+ e6 Qxe6+ dxe6 =*= Qb8#
-*- Qb8#
-*- Qb8#
Na4 Qa6+ Kb8 Kc6 =*= Qb7#
Nxf5 Kc7 Nb5+ Qxb5 Ba5+ Qxa5#
Ka7 Qb7#
-*- Qb8#
Nxd5+ exd5 Ba5 Qxa5#
-*- Qb8#
-*- Qb8#
Na2 Kc7 Ba5 Qxa5#
-*- Qb8#
Nb1 Kc7 Ba5 Qxa5#
-*- Qb8#
Ncxe4 Kc7 Ba5 Qxa5#
-*- Qb8#
Nd1 Kc7 Ba5 Qxa5#
-*- Qb8#
Qxd4 Kc8 =*= Qb8#
b2 Kc8 b1=Q Qa6#
b1=R Qa6#
-*- Qb8#
-*- Kc6 =*= Qb7#
end of solution tree (no duals except at top)
Total Time (virt) = 1.980 sec
(on K7/600)
Legend: =*= is (any legal move)
-*- is (any other legal move)
That this position is not legal did not matter to Chest.
Heiner
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