Problem 632: Eugene Rosner - Fairy (Symmetry Circe, Antipodean Circe)

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Problem 632: Eugene Rosner - Fairy (Symmetry Circe, Antipodean Circe)

(01.12.2015) Fairy twomover by Eugene Rosner with interesting combination of Circe forms which lead to cycle of mates.

a) 1.e7? Bxh6(Ra3)!

1.f4! (zz)

1…Rxe8(Rd1) a 2.Rxd4# A, 1…Bxf6(Bc3) b 2.Sa5# B, 1…Bxh6(Ra3) c 2.Sd2# C

1…d3 2.exd3# (1…fxe6(Pd3)+? is illegal)

b) 1.f4? fxe6(Pa2)!

1.e7! (zz)

1…Rxe8(Ra4) a 2.Sa5# B#, 1…Bxf6(Bb2) b 2.Sd2# C, 1…Bxh6(Rd2) c 2.Rxd4# A

1…d3 2.exd3#

Near-Lacny(the reborn rooks mating on d4 are different), cycle of mates, Argentinian twinning, reciprocal try/key. Abundant rebirth effects.

Notes: Kd6,Pe5 are crucial dual-avoiding blocks, the former also guards d5, the latter blocks the d4 rebirth square in A. (Author)

Antipodean Circe: As Circe but the rebirth square for the captured piece is the one at a distance of 4,4 from where a unit is captured (its "antipodes"). Thus a capture on c1 produces a rebirth on g5. If the rebirth square is occupied the capture is normal. Pawns reborn on promotion squares promote immediately.

Symmetry Circe: like Circe, but the rebirth square is the square diametrically opposite the capture-square, with respect to the central point of the board (e.g. capture on g6 - rebirth on b3)