Author: Uri Blass
Date: 14:04:10 09/19/02
Go up one level in this thread
On September 19, 2002 at 16:16:49, Paul wrote:
>On September 19, 2002 at 14:21:20, Uri Blass wrote:
>
>>On September 19, 2002 at 14:09:38, Heiner Marxen wrote:
>>
>>>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...
>>
>>
>>If you are interested in another problem then see the following mate in 9
>>The poster claims that mate solvers have no chance but I do not believe in it.
>>
>>http://www.f11.parsimony.net/forum16635/messages/34834.htm
>>
>>Uri
>
>And I can't imagine normal engines not finding it ... even mine says:
>
>08:24 WM9 08 Bce5 Ka2 Kc2 a5 Ba1 a4 Bbe5 a3 Kc3 Kxa1 Kb3+ Kb1 Ba1 a2 Kc3 Kxa1
>Kc2#
>
>Paul
Your is probably good in mates and I guess that a lot of engines have big
problems with it
Do you do special extension except check extensions?
Note that Movei disable extensions when the side in check has a big material
disadvantage and it does not help it to find the line because positions when
black is in check or black has only one reply do not get extended.
Uri
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