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MatPlus.Net Forum Selfmates A Forced Selfmate In 16 Ply |
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| Page: [Previous] [Next] 1 2 | (21) Posted by Hauke Reddmann [Wednesday, May 29, 2019 10:32] | I'm no s# expert, but it should be very easy to check the
problem with a solving program at least *after* Whites
1st move. | | (22) Posted by James Malcom [Wednesday, May 29, 2019 13:16] | True. | | (23) Posted by Geir Sune Tallaksen Østmoe [Thursday, May 30, 2019 08:56] | Some years ago, Valery Liskovets suggested the stipulation «CU-mate», or «completely unavoidable mate», with the notation ###. That’s not exactly the same as the «forced» selfmates presented in this thread, since ### is a stipulation and not a theme, but the idea is similar: neither player can avoid the mate. In a ###, other lines which reach mate equally fast, but which are not CU-mates, will not be valid solutions. Also, in a ###, the distance to mate does not matter, as long as it is a CU-mate.
Geir Sune Tallaksen Østmoe and Valery Liskovets
Feenschach 2014
s###10
(= 6+5 )
1.Bd5 a5 2.e3 a4 3.e4 a3 4.b4 a2 5.Be6 d5 6.e5 d4 7.b5 d3 8.b6 cxb6 9.Bd7 b5 10.e6 b4### | | (24) Posted by Geir Sune Tallaksen Østmoe [Thursday, May 30, 2019 09:05] | BTW, Rewan, if I understand you right, you mean that White is trying to achieve a selfmate in *exactly* 8 moves, so that the solutions in 7 moves are not considered cooks. That has to be specified as a fairy stipulation, because in a normal selfmate, s#8 means selfmate in «8 or less» moves. When White has an unintended solution which forces mate in 7 moves, then that’s a cook. | | (25) Posted by Frank Richter [Thursday, May 30, 2019 10:31] | More precisely, White has to play such a first move, that it follows to a forced sequence of moves for BOTH sides, that leads to a selfmate after the 16th ply.
And not earlier. | | (26) Posted by James Malcom [Thursday, May 30, 2019 20:34]; edited by James Malcom [19-05-30] | Precisely. And I don't mind it being called a fairy stipulation-it makes sense.
Also, it's a selfmate ON the 16th ply, not after. | | (27) Posted by Joost de Heer [Friday, May 31, 2019 08:20] | Perhaps a better stipulation would be 'Loss in 1'. | | (28) Posted by James Malcom [Saturday, Jul 27, 2019 17:48] | That wouldn't work Joost, as that then allows for all of those Knights to move first, which allows for solutions in 14 ply, not 16 as intended. | | No more posts | Page: [Previous] [Next] 1 2
MatPlus.Net Forum Selfmates A Forced Selfmate In 16 Ply |
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