Author: Richard A. Fowell
Date: 17:18:46 01/25/05
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Thank you very much for spending the computer time on this knotty problem.
I had been trying to piece this tree together from much less handy tools.
I'd only got these lines, so far, using the matefinder engine built into Sigma
Chess 6.1.
Bd3 Nf5 Bxf5 ...+7
Rg8 Qh4 ...+7
Qxd6 ...+7
b6 Qh4 ...+7
Kg8 Nxh7 ...+6
The Sigma Chess matefinder can find "cooks", like the two responses to Bd3 Rg8
below,
but it does not expand the defensive responses as CHEST does.
-Richard
On January 25, 2005 at 07:24:46, Andreas Stabel wrote:
>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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