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Subject: Re: Strange position - who can reach it with minimum moves?

Author: Heiner Marxen

Date: 09:37:18 07/11/01

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On July 11, 2001 at 11:47:09, Christoph Fieberg wrote:

>Chess Tiger just shows that it is mate in 8!
>
>r2qk2r/8/8/qqqqqqqq/QQQQQQQQ/8/8/R2QK2R b - - 0 1
>
>Analysis by Chess Tiger 14.0:
>
>1. -+ (-#8): 81...Ddxe4+ 82.Ddxe4 Daxb4+ 83.Kf1 Dxd1+ 84.Txd1 Dgxf4+ 85.Dgxf4
>Dfxf4+ 86.Dhxf4 Dxh1+ 87.Dxh1 Dxf4+
>2. -+ (-58.14): 81...Daxb4+ 82.Kf2 Ddxd4+ 83.Dcxd4 Ddxd4+ 84.Dexd4 Dexd4+ 85.Kg2
>Dhxg4+ 86.Ddxg4 Dgxg4+ 87.Dhg3 Dxg3+
>3. -+ (-35.92): 81...Dhxh4+ 82.Txh4 Dfxe4+ 83.Dfxe4 Dxh4+ 84.Dxh4 Dxh4+ 85.Kd2
>Dcxb4+ 86.Dcxb4 Ddxd4+ 87.Dexd4 Dhxd4+
>
>(Fieberg, Bergisch Gladbach 11.07.2001)

Yes, Chest agrees, this is a mate in 8.  There are two solution moves:

PV: Qdxe4+ Qdxe4 Qaxb4+ Qaxb4 Qxd1+ Qxd1 Qfxe4+ Qcxe4 Qe3+ Qexe3 Qxe3+ Qxe3+
Qxe3+ Qe2 Qhxe2#
PV: Qaxb4+ Qaxb4 Qdxe4+ Qdxe4 Qxd1+ Qxd1 Qfxe4+ Qcxe4 Qe3+ Qexe3 Qxe3+ Qxe3+
Qxe3+ Qe2 Qhxe2#

The PVs differ only in the first 4 plies.
(K7/600 with 30 MB hash in 5.5 minutes)

Regards,
Heiner



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