Successive twins where each new position is built by removal of one piece of either color from the position that precedes it.
Zidek, Alexander
Schach-Aktiv, 1989
1st Prize
a) 1.Kd6
Qa3+
2.Ke5
Qxe7#
b) 1.Kc5
Kd3
2.Kb4
Qc3#
c) 1.Kc7
Qa7+
2.Kd8
Qb8#
d) 1.Kd7
Qa6
2.Ke8
Qc8#
e) 1.Kd5
Qa2+
2.Ke4
Qe6#
f) 1.Kb7
Qh1+
2.Ka6
Qxa8#
g) 1.Kb6
Qg1+
2.Ka5
Qa7#
h) 1.Kb5
Qf1+
2.Ka4
Qa6#
Molnár, Árpád
Hungarian Chess Federation TT, 1991
1st Prize
a) 1.Re2
Se5
2.Re4
Rb5#
b) 1.Ke4
Be2
2.d5
Sd6#
c) 1.Ke6
Se7
2.Bf7
Re4#
d) 1.Ke5
Kxg5
2.d5
f4#
e) 1.Rc8
Bxd7
2.Rc5
Rd4#
f) 1.Rc2
f4
2.Rc5
Se7#
g) 1.d6
Bd7
2.Bc5
Sf6#
Heinonen, Unto
The Problemist, 1987
a) 1.Sd5
Be6
2.Se3
Sdf2#
b) 1.Qa6
g4
2.Qd3
Bxc6#
c) 1.Re8
Sf4
2.Re5
d5#
d) 1.f5
Be6
2.f4
Shf2#
e) 1.Bf7
Be8
2.Bd5
Bg6#
f) 1.c5
Ra5
2.cxd4
Bf5#
Heinonen, Unto
Tehtäväniekka, 2018
1st Prize
a) 1.Rg8
Qxg3
2.Be4
Qxg8#
b) 1.fxe2
Rxe2
2.c4
Re5#
c) 1.Sc6
exf3
2.Rd4
Bf7#
d) 1.Rd8
cxd8=Q+
2.Kc6
Sa7#
e) 1.Rb8
cxb8=Q
2.Ke4
Qe5#
FEN: 2N1B2r/1pP4b/8/2pk4/3n1P2/5pp1/3RP1Q1/3r2nK
External links:
Vorovich, Arkady
Plenkov, Valery
Problemist of Ukraine, Problemist of Ukraine 10 JT, 2014
Spec. Prize
a) 1.Kxc7
Bxe3
2.Rd7
Bb6#
b) 1.Bxc7
Sc6
2.Ke8
Rxe7#
c) 1.Qxd8
Bf4
2.Sc8
b8=S#
d) 1.Kd6
Sde6
2.Ke5
Bf4#
e) 1.Qxd8
Sd5
2.Ke8
Sxf6#
f) 1.Rd6
Sde6
2.Sc8
b8=S#
g) 1.Ke7
Sf7
2.Bd7
Bxf6#
h) 1.Kxc7
b8=R
2.Bd7
Bf4#
i) 1.Be4
b8=Q
2.Bc6
Qd8#
j) 1.Ke7
b8=Q
2.Bd7
Qf8#
k) 1.Ke8
Kf6
2.Bc8
bxc8=Q#