Original Problems, Julia’s Fairies – 2014 (I): January – April
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No.502 by Neal Turner – This is the 2nd author’s problem with unusual combination of SAT and Royal Grasshoppers in s#2 published on JF (the previous one was in September,2013 – No.374). Enjoy a detailed comment by Neal, who believes that “this stuff is so unusual (I’m the only one doing it!) and so radically different from other kinds of orthodox/fairy chess that it seems to be necessary.“! (JV)
SAT: A king is in check if any of its flight squares are unguarded by opposing pieces.
Grasshopper(G): Moves along Q-lines over another unit of either color to the square immediately beyond that unit. A capture may be made on arrival, but the hurdle is not affected.
Royal piece: Piece that executes a function of the King on the board.
No.502 Neal Turner
original – 21.02.2014
Royal Grasshoppers c4, f3
Solution: (click to show/hide)
1.Se7! (2.Sd5+ f5#)
(C+ by WinChloe 3.24 and Popeye 4.55-4.61, but no solutions by Py4.63,4.65)
Black’s only mobile pieces are the pawns on a3 & b6, while the main feature of the position is the mutual guard of f7 by the rGs.
So we have 3 effects from the threat move:
while the reply also has 3 effects:
All these 6 effects are required for the threat to work.
In the diagram we see that the brG is prevented from moving to f7 because of checks on a7,f5 & h5 – the key move eliminates all of these!
The post-key guard of f5 also allows the black knight into the action – by vacating e6 he’s now guarding it.
Black has one last trick up his sleeve.