Author: Andreas Stabel
Date: 04:24:46 01/25/05
Go up one level in this thread
On January 19, 2005 at 11:20:14, Richard A. Fowell wrote:
>As several of you have pointed out - Chessmaster 9000 finds Mate in 9 in a few
>seconds. Ruffian agrees after a lot of thought (probably less than the 7.5 hrs
>here -
>I just ran it overnight:
>
>+mate 9 27/5 07:30:44 1913762K 70763
>
>1. Bd3 Rg8
>2. Qh4 h5
>3. Bxg6 fxg6
>4. f7 Rg7
>5. Qd4 Nf5
>6. Re1 Nxd4
>7. Re8 Qxe8
>8. fxe8=Q Rg8
>9. Bxd4
>
>A lot of engines have trouble this this one!
>Given all the "mate 11, mate 10, etc." solutions, it would be nice if some
>matefinder like Chest could confirm the best solution here, but apparently
>there is a large branching factor.
>
>-Richard
>
CHEST version 3.19, 18-Dec-1999
Options = -r -S -z 9 -l
Input file: 'doit.inp'
Reading job:
# Mate in ?
W: Kf1 Qf4 Ra1 Rh1 Bb2 Bc4 Ng5 Pa2 Pf2 Pf6 Pg2 Ph2 (12)
B: Kh8 Qd8 Ra8 Rf8 Bc8 Nb8 Nd6 Pa7 Pb7 Pc7 Pd7 Pf7 Pg6 Ph7 (14)
FEN: rnbq1r1k/pppp1p1p/3n1Pp1/6N1/2B2Q2/8/PB3PPP/R4K1R w - -
analysing (mate in 9 moves):
Solution (in 9 moves):
Bc4 - d3
Time (virt) = 149631.728 sec (ca. 2493.9 min) (ca. 41.6 hrs)
Bd3 Nf5 Bxf5 ...+7
Qe8 Nxh7 ...+7
Qh4 ...+7
Re8 Bxg6 ...+7
Qh4 ...+7
Rg8 Qh4 ...+7
Qxd6 ...+7
b6 Bxg6 ...+7
Qh4 ...+7
Kg8 Nxh7 ...+6
Nc4 Bxc4 ...+6
Bxg6 ...+6
Nh3 ...+6
Nxh7 ...+6
Qh4 ...+6
Qxc4 ...+6
Ne8 Bxg6 ...+6
h5 Bxg6 ...+6
Ne4 Nxe4 ...+5
h6 Qh4 ...+5
Nb5 Nf3 ...+4
Nh3 ...+4
Nxh7 ...+4
Qh4 ...+4
Qe7 fxe7+ ...+2
Qxf6 Qxf6+ ...+1
-*- Qh4 ...+4
end of solution tree
Total Time (virt) = 172900.130 sec (ca. 2881.7 min) (ca. 48.0 hrs)
Regards
Andreas
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