Rovno theme
Exchange of places of two pieces of the same kind but opposite colour in at least two phases.
See also: Place exchange.
Alias: Rivne theme.
Piliczewski, Bogusz
The Problemist, 2013
2nd HM
h#3 4.1... (6+9)
1.Sb1
Sxe4
2.Sc3
Sc2
3.Sexd5
Sd2#
1.Sxd5
Sd1
2.Sc3
Sc2
3.Sb3
Sde3#
1.Sb3
Sxf3
2.Sd4
Sa2
3.Sxd5
Sd2#
1.Sc2
Sxf5
2.Sd4
Sa2
3.S2b3
Se3#