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MatPlus.Net Forum Selfmates A Forced Selfmate In 16 Ply

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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.

True.

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###

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.

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 Rewan Demontay (Real Name: James Malcom) [Thursday, May 30, 2019 20:34]; edited by Rewan Demontay (Real Name: 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.

Perhaps a better stipulation would be 'Loss in 1'.

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.

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MatPlus.Net Forum Selfmates A Forced Selfmate In 16 Ply