Juraj Lörinc (Slovakia)
Original Problems, Julia’s Fairies – 2013 (I): January – April
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No.288 by Juraj Lörinc – An interesting cyclical play after three fairy promotion! (JV)
Anti-Circe (Cheylan): When a piece captures (including King), it must come back to its rebirth square. If this square is occupied, the capture is forbidden. A Pawn capturing on its promotion rank promotes before it is reborn. The captures on the rebirth square are forbidden.
Camel-Rider(CR): As Nightrider but plays on Camel-lines only.
Camel – (1,3) Leaper
Nightrider(N): A Rider along a straight line on squares lying a Knight`s move away from each other.
Rook-Kangaroo-Lion(RKL): Moves along R-lines over 2 hurdles of either color (which may or may not stand on adjacent squares) to any square beyond the 2nd unit. A capture may be made on arrival, but the hurdle is not affected.
No.288 Juraj Lörinc
Anti-Circe type Cheylan
Camel-Riders: d2, e2
Rook-Kangaroo-Lions: g2, h8, c8
Solution: (click to show/hide)
In the initial position CRd2 guards a1, a3. Pb2 is pinned by RKLg2.
All keys provide the second hurdle to the 8th row, threatening directly RKLa8# (in this mate, a1 and a3 are guarded by RKLa8, not CRd2).
Black defends by placing the third piece onto the 8th row, interefering with the threatened move.
But as a consequence, three of possible rebirth squares of promoted Pb2 are blocked, allowing mate by precise battery mate given by CRe2, blocking the remaining 4th rebirth square. This battery check unpins Pb2, but the pawn remains immobile nevertheless.
This is an underlying mechanism of carousel change Z-32-33.
Then departure of RKLc8 defends by removing one necessary hurdle, but the error is unblocking of rebirth square of capturing CRs, always the promoted ones, specifying the keys. This gives additional Z-31-13.
Finding suitable refutations was not easy (and the main reason why I haven’t finished the problem already in 2011, when I had found the main scheme). 1…Bg8 is similar to carousel defences, 1…Ra1 is more subtle as it provides flight to Ka1 due to rebirth square b8 blocked by the key.
Overall, there is an (Anticirce + fairy pieces)- typical strategy with emphasis on promotions (keys, defences, avoided moves) and additional effects, with duel of Ph2 and CRe2 and formal change theme Z-33-46 including carousel change.
(The scheme does not work with ordinary (rook) lions and without occupied c8 as Qd8 would guard a8, rebirth square of white fairy pieces checking bK.)