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Original Problems, Julia’s Fairies – 2013 (III): September- December
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No.374 by Neal Turner – A very seldom fairy combination – SAT with Royal Grasshoppers – in s#! (JV)
SAT: A King is under check if it can move to only one square not controlled by the opposite side.
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.
No.374 Neal Turner
s#2 SAT (10+8)
Royal Grasshoppers: d4, f5
Solutions: (click to show/hide)
1.Se2! (> 2.rGf1+ rGd1# )
(C+ by Popeye 4.55)
Examining the brG’s flights: d1,d7 & g4, we see that moving is prevented by arrival checks on a1,f7 & e4.
The opening of the f-file has given the Rf2 some limited movement – just enough to prevent the threat, but this allows the Se3 to take centre stage.
1..Bg8 prevents the threat by unguarding d3, but now that the 1st rank is off-limits White turns his attention to the 8th rank.
The third defence provides Black with a flight as after 1..exd6 there’s no longer a hole on f7, so the brG is free to run to d7.
The problem seems very interesting and I believe that it’s indeed interesting.
The explanation seems good and I believe it’s indeed good.
The definition of SAT seems clear and simple but I don’t believe that it’s clear. I tried the other source but that only additionally blurred my faint idea of SAT.
I’ll try again tomorow 🙂
You’re right, Nikola, the definition is more like my understanding and it is really unclear! 🙂
Another one (from StrateGems) is: SAT – A King is in check only if he can move on an unattacked square.
Is this one better?
Yes, the definition of SAT can be perplexing.
My own working definition is simply:
‘A king is in check if any of its flight squares are unguarded by opposing pieces.’
I’m not sure if this can be derived from the ‘official’ definition in the strict sense, but it seems to serve adequately and is certainly less confusing.