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Subject: Re: If you like to sove a mate...

Author: Heiner Marxen

Date: 13:04:47 03/10/01

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On March 10, 2001 at 08:11:29, leonid wrote:

>Hi!
>
>If you like to solve one light mate then you can try this:
>
>[D]nqNBNqn1/2QKQ3/Nq3qN1/n1rkr1n1/R1NbN1R1/1n1q1n2/8/Q2B2Q1 w - -
>
>Please, indicate your result.
>
>Thanks,
>Leonid.

Chest needs just 71 seconds (K7/600) and mere 16MB hash to find 8 (!)
solutions in 8 moves.  Here are the PVs:

N4xb6+ Nxb6+ Nxb6+  Qfxb6 Qgxd4+ Qxd4  Qxd4+  Nbxd4 N8f6+  Nxf6+ Nxf6+ Qfxf6
Qexc5+ Qxc5 Qxc5#
N4xf6+ Nxf6+ Nxf6+  Qbxf6 Qgxd4+ Qxd4  Qxd4+  Nfxd4 N8b6+  Nxb6+ Nxb6+ Qbxb6
Qexe5+ Qxe5 Qxe5#
N8xb6+ Nxb6+ Nxb6+  Qfxb6 Qgxd4+ Qxd4  Qxd4+  Nbxd4 N8f6+  Nxf6+ Nxf6+ Qfxf6
Qexc5+ Qxc5 Qxc5#
N8xf6+ Nxf6+ Nxf6+  Qbxf6 Qgxd4+ Qxd4  Qxd4+  Nfxd4 N8b6+  Nxb6+ Nxb6+ Qbxb6
Qexe5+ Qxe5 Qxe5#
Nc3+   Bxc3  N4xb6+ Qbxb6 Bxb3+  Nxb3  Qgxc5+ Nxc5+ Qexc5+ Qbxc5 Nf4+  Qxf4
Qb7+   Qc6+ Qxc6#
Ne3+   Bxe3  N4xf6+ Qfxf6 Bxf3+  Nxf3  Qaxe5+ Nxe5+ Qcxe5+ Qbxe5 Qh1+  Qde4
Qxe4+  Qxe4 Qxe4#
Qaxd4+ Qxd4  N8xf6+ Nxf6+ Nxf6+  Qbxf6 Qxd4+  Nfxd4 N8b6+  Nxb6+ Nxb6+ Qbxb6
Qexe5+ Qxe5 Qxe5#
Qgxd4+ Qxd4  N4xf6+ Nxf6+ Nxf6+  Qbxf6 Qxd4+  Nfxd4 N8b6+  Nxb6+ Nxb6+ Qbxb6
Qexe5+ Qxe5 Qxe5#

Here Chest is comparatively fast, since black can attack the white king,
once white does a non-checking move.

Heiner



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