Author: Paul
Date: 14:14:45 09/19/02
Go up one level in this thread
On September 19, 2002 at 17:04:10, Uri Blass wrote:
>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#
>Your is probably good in mates and I guess that a lot of engines have big
>problems with it
Yes, and they are probably better game players ;) ... I was just teasing a
little ...
>Do you do special extension except check extensions?
I think that the usual pawn push and few reply extensions make this easy for
mine.
Paul
>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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