|pieces||'Royal piece', 'Grasshopper(G)'|
|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.|
|SAT:||A King is under check if it can move to at least one square not controlled by the opposite side.|
No. 1544 Neal Turner
original - 19.09.2020
Royal Grasshopper f4, b6
Solution: (click to show/hide)
(C- by Popeye & WinChloe !!!)
So we feature Nietvelt Defences – a black piece self-pins in anticipation of being unpinned in the threat. White changes course, taking advantage of the pin.
Here we have a type of pinning specific to this fairy combination.
We note the square d4 is observed by both kings, and that moving either of the hurdles on c5 or e4 would be check.
So any black piece sitting on e4 will be pinned.
But Black notices that the threat move 2.Se6+ puts a guard on d4, which would free the e4 piece.
After 1..Sxe4 2.Se6+ Black blocks with 2..Sf6+ and now with the bishop's line opened we have 3.Bf5.
After 1..Bxe4 2.Se6+ the bishop can simply defend by going to c6 or f5.
This is all very nice, but the computer says No!
Noting the royalgrasshoppers on the board, the programs want to play 1..f2-f1=G and after 2.Se6+ we have 2..Gf5.
I think I've mentioned this tendency earlier, and of course usually it has no significance. But here it's threatening the very existence of the problem, so in reply to the computer the composer says No, No, No! We don't accept it.
(Anybody interested in seeing more examples of pinning strategies with this condition can check out the latest issue Juraj's e-zone Conflictio No.27 on the Articles page on this site.)