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Problem 535. Karol Mlynka - Fairy (Winged King, Back to Back, Haaner Chess)
karol.mlynka(17.02.2015) Fairy problem by Karol Mlynka with eight solutions in twin form (4 thematic connected pairs).
a) 1.Bb5 WKb4 2.Bf1 WKg5 3.f4 WKf3#
b) 1.Bf5 WKf6 2.Kg3 WKe5 3.Kh4 WKf4#
c) 1.g3 WKe4+ 2.Kf4+ WKf5+ 3.Kh3 WKg1#
d) 1.Ke1 WKe2+ 2.Kh2 WKg5 3.Ph4 WKh3#
e) 1.Be4 WKh2 2.Bh7 WKg7 3.Kg2 WKg3#
f) 1.Bc6 WKxc6+ 2.Kb7+ WKb8+ 3.Ka7+ WKa8#
g) 1.Ba8 WKc4+ 2.Kb5+ WKb6+ 3.Ka6+ WKa7#
h) 1.Be3 WKe4 2.Bd5+ WKc5 3.Kd3 WKd4#
Rex solus with  switchback of White or Black (a, b), long moves of bK (c, d), four successive checks (f, g) and hurdle creation of bB  (e, h). (Author)
Winged King: piece moving like a Queen until it reaches an occupied square (the hurdle). Then, from that square, it makes a "King" move.
For example with a winged King (black or white) in a1 and a Knight (black or white in g7), the winged King can go in f8-g8-h8-h7-h6-g6-f6-f7. In Popeye it is named "Royal Marguerite"
Back-to-Back: When pieces of opposite colors stand back-to-back with each other on the same file, they exchange their roles. P on the first rank cannot move. Any piece can make an en passant capture when it is given a power to move as P by BTB.
Haaner Chess: any already left square can not be neither occupied nor crossed.


0 #1 Seetharaman Kalyan 2015-02-17 05:46
Not sure if I understand the movement of Winged King.
Q1:For example, in the first solution black moves 3.g3 when white King is on g5. With g3 now in position is not black king already in check? (therefore 3.g3 is illegal check?).
Q2: On an empty board (no hurdles) the WK has no moves or does it move like a queen?
Q3: Why the mate in the first solution 3...Kf3# is not self-check for WK? Even if the black king moves only like winged King,(due to BTB condition) is it not still checking the white king via hurdle g3?
+2 #2 Juraj Lorinc 2015-02-17 08:10
Based on the Q1, I have just checked a) position by WinChloe and have found important fact: there is mistake in the solution a). It should be:
a) 1.Bb5 WKb4 2.Bf1 WKg5 3.f4 WKf3#

Then the answer A1 to Q1 is clear. Yes, it would be illegal self-check.

A2: on an empt board Winged King is immobile.

A3: Yes, it would be selfcheck. Compare to mating picture in the solution above, it is both ok and quite fairy with 8 potential flights to be guarded e1-e4 and g1-g4, besides direct check from f3 to f2.
0 #3 Seetharaman Kalyan 2015-02-17 15:48
Thanks Juraj. 3.f4 makes things right! (and uses the BTB condition). With BP at f4 the mating move 3...WKf3 is legal as BK after this move like Winged-King and hence WK is not in check!

Now I can look at the other 7 solutions!!
0 #4 Diyan Kostadinov 2015-02-17 17:53
Thanks Juraj, the solution is now corrected.
Yes, the Winged King is not so used fairy piece but looks interesting.
Another good example is problem n.493 (actually there I saw this fairy piece for the first time).

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