Author: Bernhard Bauer
Date: 07:45:58 09/21/99
Go up one level in this thread
On September 21, 1999 at 08:43:51, leonid wrote:
>For those who like to solve an unusual mate position here is the next one.
>This is not that simple to find since this is the mate in 8 moves. Black
>goes and mate.
>
>Beyond the fun those positions are the best way to spot the bugs in the
>code. With positional move you can never say where your moves generator lies
>to you. With inevitable mate position you can verify it and feel you good.
>
>White pieces:
>1) Queens: F7,G7,H7,E6,F6,H6,F5,G5,H5.
>2) King on G6.
>
>Black pieces:
>1) Rooks: C7,D7.C4.
>2) Knights: G3,H3.
>3) Queens: F3,D2,E2,F2,F1.
>4) Bishops: B2,A1,B1.
>5) King: D1.
>
>I verified the position today. On AMD 400Mhz logic says that mate in 7 move
>do not exist. Took 9 minutes 5 second to say this. Solution in 8 moves was found
>through the brute force in 1 minute and 8 sec. Through "quick logic" solution in
>8 moves was found in 0.3 sec.
>
>Take care! This position can bring down your best game.
>
>Leonid.
My best game (crafty16.18) running on a 450 MHz PC doesn't go down.
5-> 7.59 24.35 1. ... Qxf5+ 2. Qfxf5 Qxf5+ 3. Qexf5
Rd6+ 4. Qg7f6 Qxf5+ 5. Kg7 Nxh5+ 6.
Qhxh5 Bxf6+ 7. Qxf6 Bxf6+
6 7.63 ++ 1. ... Qxf5+!!
6 31.87 Mat08 1. ... Qxf5+ 2. Qfxf5 Qxf5+ 3. Qexf5
Qxf5+ 4. Qfxf5 Nf4+ 5. Qxf4 Rxg7+ 6.
Q6xg7 Rxg7+ 7. Kh6 Qxf4+ 8. Qxf4 Qxh5#
6-> 56.63 Mat08 1. ... Qxf5+ 2. Qfxf5 Qxf5+ 3. Qexf5
Qxf5+ 4. Qfxf5 Nf4+ 5. Qxf4 Rxg7+ 6.
Q6xg7 Rxg7+ 7. Kh6 Qxf4+ 8. Qxf4 Qxh5#
Kind regards
Bernhard
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