|Rokagogo:||A King and a Rook may castle everytime and everywhere (even when they have already moved) if: • both are one the same rank or file • there are at least two squares between them • all squares between them are empty • the King is not in check and he does not move over an observed square. Castling is done by moving the King two squares towards the Rook and then moving the Rook to the square behind the King.|
No. 1682 Andrew Buchanan &
James Malcom Singapore / USA
original - 15.01.2022
Solution: (click to show/hide)
(C+ by WinChloe 3.52)
Yes the solution is just Staugaard castling! But if we put that as the stipulation, then solving would be trivial. Note that the wR in the starting position is not a tease: it is necessary to prevent duals: Re8-e2# or Qe8-e2#. But it may distract some solvers into thinking *this* is the rook with which wK must dance.1. ... Kc2! is the strongest defence - other responses permit 2. Kd2(+) etc. Beyond that point, Staugaard is the only way. This is C+, and we believe that given the position this implies HC+ for Staugaard, if that were the stipulation.
This composition is intended as an economy record for the Rokagogo/Staugaard excelsior. If someone can produce the same effect with lighter material, we would be very pleased to see it.
In this #6, black king “is in a cage” and has only repetitive moves. So it is better to show the idea in ser-#n : White : Ké1 Rh1 Pé2 Black : Kç1 Ba1 ser-‡6 (3+2) C+ Rokagogo
1.é4 2.é5 3.é6 4.é7 5.é8=R 6.Ké3(Ré2)‡
But it is only a scheme, and I think it is possible to produce much better problems with it. Another weakness : in Rockagogo, the spectator is expecting more than one castling…
Hi Sebastien nice to hear from you hope you are well. Your points are well taken. In a way, the “Rokagogo” concept is a joke – this is really yet another Staugaard problem but (1) WinChloe can validate R but not S (2) it’s an attempt at a Staugaard directmate economy record, with the idea that people may think “Oh they are doing Rokagogo now”, well we aren’t heh.
Really the idea of an “economy record” can reduce artistic content, and I think that’s what’s perhaps happened here.
Dear Andrew, thank you, yes I am fine, no covid case for the moment ! 🙂
I think that the condition Rosue is more interesting to work than Rokagogo, because you can make castling with other pièces than Rook.
But in the case of the ser#6 I have proposed, with Roque 5.e8=Q is also possible !
Condition Roque…I want to say
The rokagogo definition doesn’t explicitly forbid castling to a square that is guarded, but not after the castling move (e.g. wKe1 wRh1 bMOe2).
Good point. This relates to an ongoing discussion in MatPlus. I guess guarded e1 (i.e. check) still prevents castling> what about guarded f1?