In the initial position, a black King's flight is blocked by the black piece A. In the final position, the same flight square is blocked by another black piece B.
Garai, Toma
Thema Danicum, 1976
Prize
a) 1.Qg1
Sg3
2.Rf1
Se4
3.Ra1
Sc3#
b) 1.Qh8
Sf2
2.Bg7
Sd3
3.Ba1
Sc1#
Caillaud, Michel
Shakhmatna Misl, 1982
1st Prize
1.Bd8
a5
2.Bb6
axb6
3.c1=B
b7
4.Bg5
b8=S
5.Be7
Sd7#
1.Qb3
a5
2.Qb6
axb6
3.c1=Q
b7
4.Qc4
b8=S
5.Qf7
Sd7#
1.Rb8
a5
2.Rb6
axb6
3.c1=R
b7
4.Rc8
b8=S
5.Re8
Sd7#
Loustau, Jean-Marc
Ideal-Mate Review, 1986
Prize
1.Sc7
Kf1
2.Kd5
Kg2
3.Bd6
Kg3
4.c5
Kf4
5.Sc6+
Kxe3
6.e5
Kd3
7.Se6
e4#
Nastran, Janez
Slovenian Championship, 1993
1st Place
a) 1.Qf2
Qxe6+
2.Sxe6
Rxf2#
b) 1.Qd7
Qxe5+
2.Rxe5
Bxd7#
c) 1.Qd5
Qxf4+
2.Bxf4
Rxd5#
Trillon, Jean-Michel
feenschach TT-25, 1972
2nd Prize
1.Rg8+
Kd7
2.Rb7+
Kxc6
3.Rbg7+
Kb5
4.Rb8+
Ka4
5.Rb2
Sc3#
Moen, Kabe
The Problemist Supplement, 2019
a) 1.Re5
Bh7
2.Sc5
Bd3
3.Sde6
Be4#
b) 1.Bd6
Rf1
2.Sc6
Rf7
3.Sed4
Rf5#
Foldeak, Walter Arpad
Revista de Sah, 1963
5th HM
1.h3
b8=R
2.h2
Rxb2
3.h1=R+
Rh2
4.Sb2
Rh3
5.Rb1
Ra3#