Paros theme
Two black Bi-valves, involving the same two lines, in such way that the line, which is opened in the first line of play, is closed in the second and vice versa.
See also: Bi-valve.
Alias: Reciprocal bi-valve.
Semenenko, Valery
Belgrade Internet Tourney, 2012
6th HM
h#2 b) +wSe8
(3+10)
a) 1.Se2+
Kxe4
2.Bc7
Qf8#
b) 1.Sg3+
Kxf4
2.Re7
Qa8#
Kricheli, Josif
Schach-Echo, 1974
h#2 2.1... (6+7)
1.Sb3
Be4
2.Ke3
Qc1#
1.Sd7
Re4+
2.Kxf5
Ra5#
Bicolor Paros.