Author: Heiner Marxen
Date: 06:50:06 12/11/02
Go up one level in this thread
On December 11, 2002 at 00:29:27, Mike S. wrote:
>In this study, Black has either only one legal move (1st-7th), or there is only
>one move which avoids immediate mate (8th/9th):
>
>Kok,T - [+3350.47g2b7]
>td06 {v}, 1938
>[D]qrb5/pk1p4/p2Pp3/p3Pp2/B4P2/1P6/5pK1/6B1 w - - 0 1
>1.Kxf2 Kb6 2.Ke2+ Kb7 3.Ke3 Kb6 4.Kd3+ Kb7 5.Kd4 Kb6 6.Kc4+ Kb7 7.b4 axb4 8.Bd1
>a5 9.Kb5 a6+ 10.Ka4 Qa7 11.Bf3# 1-0
>
>P3/700 MHz, 64 MB hash:
>
>Analysis by Goliath Light 1.5:
>
>1.Bxf2
> -+ (-15.60) Depth: 6/8 00:00:00
> -+ (-15.64) Depth: 7/9 00:00:00
>1.Kxf2 Kb6 2.Ke2+ Kb7 3.Ke3
> = (0.00) Depth: 7/10 00:00:00 1kN
> +- (#11) Depth: 16/39 00:00:10 14218kN
>
>
>Analysis by Nimzo 8:
>
>1.b4
> -+ (-21.08) Depth: 1/11 00:00:00
>1.Bc6+ Kxc6
> -+ (-20.62) Depth: 1/11 00:00:00
> -+ (-20.12) Depth: 1/11 00:00:00
>1.Bh2
> -+ (-17.59) Depth: 1/11 00:00:00
> -+ (-17.59) Depth: 1/11 00:00:00
>1.Bxf2
> -+ (-14.96) Depth: 1/11 00:00:00
> = (0.00) Depth: 16/34 00:00:03 991kN
>1.Kxf2 Kb6 2.Ke2+ Kb7 3.Ke3 Kb6 4.Kd3+ Kb7 5.Kd4 Kb6 6.Kc4+
> +- (#5) Depth: 16/34 00:00:03 991kN
> +- (#9) Depth: 16/34 00:00:08 4346kN
>
>(Too small number of moves in the mate announcement is typical for N8, but the
>pv is ok so far.)
>
>
>Analysis by Yace 0.99.56:
>
>1.Bxf2
> -+ (-11.79) Depth: 1 00:00:00
> = (0.00) Depth: 16/28 00:00:04 2339kN
>1.Kxf2 Kb6 2.Ke2+ Kb7 3.Ke3 Kb6 4.Kd3+ Kb7 5.Kd4 Kb6 6.Kc4+ Kb7 7.b4 axb4 8.Kxb4
>a5+ 9.Kxa5 a6 10.Bd1 Qa7 11.Bf3#
> +- (#11) Depth: 16/28 00:00:05 2753kN
> +- (#11) Depth: 18/28 00:00:22 15212kN
>
>Perfect.
>
>Regards,
>M.Scheidl
This one is easy even for Chest: on an Athlon 1500+ Chest needs 20.68 seconds
to be sure about the solution, and 37.47 secs to print the complete solution
tree. Chest confirms that this is a mate in 11 with a unique key move:
PV: Kxf2 Kb6 Ke2+ Kb7 Ke3 Kb6 Kd3+ Kb7 Kd4 Kb6 Kc4+ Kb7 b4 axb4 Bd1 a5 Kb5 a6+
Kxa5 b3 Bf3#
The complete solution tree is not much larger:
Kxf2 Kb6 Ke2+ Kb7 Ke3 Kb6 Kd3+ Kb7 Kd4 Kb6 Kc3+ Kb7 b4 axb4+ Kxb4 a5+ Kxa5 a6
Bd1 =*= Bf3#
Kc4+ Kb7 b4 axb4 Bd1 a5 Kb5 a6+
Ka4 =*= Bf3#
Kc4 =*= Bf3#
Kxa5 =*= Bf3#
-*-
Bf3#
-*- Bf3#
Kxb4 a5+ Kxa5 a6
Bd1 =*= Bf3#
Cheers,
Heiner
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