Author: Heiner Marxen
Date: 11:09:38 09/19/02
Go up one level in this thread
On September 18, 2002 at 16:59:21, Dieter Buerssner wrote:
>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.
I'm not so confident: depth 7 needs 243 seconds here, with an EBF over 10.
Hence I estimate over 3 days for depth 10 ...
I'll let it run a bit, just in case of surprises...
>Regards,
>Dieter
Cheers,
Heiner
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