Authier theme
On the first move a black piece unpins the white piece which immediately plays off the pin-line. Then the same black piece discovers a check but at the same time unpins another white piece which interposes the check and mates. Note that the second half of the solution is identical to a two-move Guidelli theme.
See also: Guidelli theme.
Authier, Gabriel
L'Echiquier de Paris, 1954
h#2 (5+7)
1.Be2
Rc5
2.Bh5+
Bf2#
Niemann, John
Feenschach, 1963 (corr.)
2nd Prize
h#3 (5+8)
1.Sd5
Bb6
2.Sf4+
Sd5
3.Sg2+
Sef4#