In two phases one side, White or Black, makes the same two moves in reversed order.
Alias: Reciprocal moves.
Kramár, Tibor
Olympic Tourney "Novi Sad", 1990
2nd HM
1.Bh7+
Bc3+
2.Rd4+
c7#
1.Rh6+
c7+
2.Bb5+
Bc3#
Feather, Christopher John
Moultings 12, 1993
1.a5
Sxa5
2.Kb4
Sd5+
3.Kxa5
Ra8#
1.d5
Sxd5+
2.Kc4
Sa5+
3.Kxd5
Rd8#
Meinking, Dan
Wiehagen, Rolf
F. Abdurahmanovic-60 JT, StrateGems, 2000
2nd Prize
1...Re2
2.Kc4
Rxa2+
3.Kb3
Rf2
4.Bb1
Be2
5.Ka2
Bc4#
1...Be2
2.Ke4
Bxg4+
3.Kf4
Bd1
4.g5
Re2
5.Kg4
Re4#