Author: Roy Eassa
Date: 13:57:44 06/04/02
Go up one level in this thread
On June 04, 2002 at 16:40:46, Helmut Conrady wrote:
>On June 04, 2002 at 16:09:23, Robert Hyatt wrote:
>
>>On June 04, 2002 at 14:25:51, Helmut Conrady wrote:
>>
>>>On June 04, 2002 at 12:56:05, Robert Hyatt wrote:
>>>
>>>>On June 04, 2002 at 08:43:27, Helmut Conrady wrote:
>>>>
>>>>>On June 03, 2002 at 20:02:51, GuyHaworth wrote:
>>>>>
>>>>>>
>>>>>>At http://www.chessbase.com/newsdetail.asp?newsid=339
>>>>>>
>>>>>>there is a report that in the 7th Round of the 2nd CSVN Computer chess
>>>>>>tournament (Leiden), 'mate in 64' was announced against Morphy.
>>>>>>
>>>>>>The question was also asked: "is this a record?" to which we might add....
>>>>>>
>>>>>>a) in tournaments, and/or
>>>>>>b) in all computer-computer games
>>>>>>
>>>>>>Examples of deeper forced win announcements welcome. I believe KNNKP has
>>>>>>occured ... and maybe KQPKQ has occured.
>>>>>>
>>>>>>g
>>>>>
>>>>>The longest mate in a human otb-play I know arose in Landau-Abrahams,
>>>>>Bournemouth 1939, with a # in 142 in this position:
>>>>>
>>>>>[D]6k1/5R2/K7/1n1nN3/8/8/8/8 b - - 0 78
>>>>>
>>>>>Helmut
>>>>
>>>>
>>>>I think he was looking for "the longest _announced_ mate"...
>>>
>>>Of course. But I thought this would be interesting, too...
>>>>
>>>>I can't imagine any human saying "mate in 142" whether in a game, in
>>>>analysis, or whatever...
>>>
>>>
>>>BTW: The longest COMPOSED problem is a mate in 271!!
>>>
>>>Helmut
>>
>>
>>I remember one such position. Where the king had to walk across the board,
>>force the opponent to move a pawn, then back across the board to eat it, then
>>back again.
>
>
>[D]8/Bk3p1p/1P3p2/KP2n2p/1P1p4/1Pp2p2/B1P5/7B w - - 0 1
>
>Petrovic 1969
>
>Helmut
>
>Not too hard for a human to see that. Probably impossible for
>the computer.
OK, I get this far but don't know why White would need to move the king back to
the queenside:
1.Bb1 f5
[1...Kc8? 2.Bxf3 Nxf3 3.Ka6 +-]
2.Ka4 Ka8
[2...Kc8? 3.b7+ Kxb7 4.Bxd4 +-]
3.Ka3 Kb7 4.Ka2 Ka8 5.Ka1 Kb7 6.Ba2 Ka8 7.Kb1 Kb7 8.Kc1 Ka8 9.Bb1
{to prevent ...d3}
9...Kb7 10.Kd1 Ka8 11.Ke1 Kb7 12.Kf2 Ka8 13.Kg3 Kb7 14.Kf4 f6 15.Kxf5
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