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Subject: Re: 2 mates to solve

Author: Heiner Marxen

Date: 14:11:47 05/26/01

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On May 26, 2001 at 15:46:20, Uri Blass wrote:

>[D]2nbkn2/1P1pp1P1/1qPrPq1r/B2N3b/3PN3/q1RB4/3K2Q1/5R2 b - -
>
>This position is based on leonid's position but it is black to move.
>
>Black can force mate in at most 11 when the main line begins with
>
>1...Qbb2+ 2.Ke3 Qxd4+ 3.Kxd4 Rxd5+ 4.Ke3 Bb6+ 5.Bxb6 Qxb6+ 6.Nc5 Qbxc5+
>7.Rxc5 Rd3+
>
>Junior found this line and yace by going forward and backward decided to believe
>Junior.

Chest agrees completely, this is a mate in 11, and Qbb2+ is the only key
move for this.  Chest gives the same PV, except for two exchanged moves:

Qbb2+ Ke3 Qxd4+ Kxd4 Bb6+   Bxb6 Rxd5+  Ke3  Qxb6+  Nc5 Qbxc5+ Rxc5 Rxd3+  Ke4
Nd6+   Kf4  Nxe6+ Ke5  Re3+  =*= Qxc5#

(11 minutes on K7/600 with 350MB hash)

Your second position is not yet ready...

Heiner



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