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Subject: Re: Mate Test Suite

Author: Dieter Buerssner

Date: 13:59:21 09/18/02

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On September 17, 2002 at 22:57:26, Dann Corbit wrote:

>Which engine finds the checkmate in this one:
>r3nr1k/ppqbNpp1/7p/2p1p3/2B4Q/P4P2/1PP4P/2KR2R1 w - -
>?
>
>Not just the key move -- the checkmate sequence.

You already got two answers with small time. Yace needs much longer, but then
comes up with a mate one move shorter:

 817388866 1:00:40  14.55 12.  1. Rxg7 Qb6 2. Rg6 Qxg6 3. Nxg6+ Kg7 4. Nxf8
                               Bf5 5. Qe7 h5 6. Rg1+ Bg4 7. fxg4 Kh6 {1271}
 822949514 1:01:11  14.95 13++ 1. Rxg7 Qb6 2. Rg6 Qxg6 3. Nxg6+ Kg7 4. Nxf8
                               Bf5 5. Qe7 Kh8 6. Qxf7 Be6 7. Nxe6 b6 8. Rd7
                               Nd6 {1351}
 827685275 1:01:37  15.95 13++ 1. Rxg7 Qb6 2. Rg6 Qxg6 3. Nxg6+ Kg7 4. Nxe5
                               Nf6 5. Rg1+ Bg4 6. Rxg4+ Kh8 7. Qxf6+ Kh7 8.
                               Nxf7 Rfd8 9. Nxd8 h5 {1771}
 840501076 1:02:33  20.95 13++ 1. Rxg7 Qb6 2. Rg6 Rg8 3. Rxb6 Nf6 4. Rxf6 Bf5
                               5. Nxf5 Rg7 6. Nxg7 Kh7
1078767385 1:16:27  Mat10 13t  1. Rxg7 Qb6 2. Rg6 Qxg6 3. Nxg6+ Kg7 4. Rg1 Nf6
                               5. Nxe5+ Bg4 6. Rxg4+ Nxg4 7. Nxg4 h5 8. Qxh5
                               Kg8 {HT} {771}

The part of the solution hidden in the HT is: 9. Qh6 Rad8 10. Nf6#

So, this seems to be a problem, solvable by Chest in reasonable time.

Regards,
Dieter




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