2005 and CYCLONE 50-40-30-20-10 years ago

1...Kd5 a 2.Sxe3# A
1...Sb3 b 2.Bxb3# B
1...Kd3 c 2.Se5# C
1...Sb5 d 2.Bxb5# D

1.Se2! th. 2.Qd4#
1...Kd5 a 2.Bb3# B
1...Sb3 b 2.Se5# C
1...Kd3 c 2.Bb5# D
1...Sb5 d 2.Sxe3# A

The famous pioneer 4-fold Lacny cycle was much ahead at its time - the judge was wrongly telling about double reciprocal change...

1...Rd4 a 2.Bxh2# A
1...d5 b 2.Sc6# B
1...Bxf7 c 2.Qf6# C

1.Sc3! th. 2.Bxh2, Sc6, Qf6#
1...Rd4 a 2.Qf6# C
1...d5 b 2.Bxh2# A
1...Bxf7 c 2.Sc6# B

Ingenious idea how to combine the Lacny cycle with the Fleck separation by Petrus Overkamp.

1.Sxb4? th. 2.Qd5# A
1...Bxh3 a 2.Qe5# B
1...e3!

1.f4? th. 2.Qe5# B
1...Bxh3 a 2.Qc5# C
1...exf3 e.p.!

1.Sa4! th. 2.Qc5# C
1...Bxh3 a 2.Qd5# A
(1...e3 2.Qd5#
1...Rh8+ 2.gxh8Q#)

The Ukrainian cycle with black defending Bishop - the idea which was then repeated several times. Here, the pioneer position by Erkki Heinonen.

1.Bxg6? th. 2.h8S th. 3.Sf7# Bxg6 3.S8xg6,S4xg6#
1...Sc7,Sb4 a 2.Se8+ A Kd5 3.S(x)c7#
1...Rxb6 b 2.Sd7+ B Kd5 3.Sxb6#
1...Qxg3 c 2.Sg4+ C Kd5 3.Se3#
1...Rxd6 d 2.Sxh5+ D Kd5 3.Sf4#
1...Rg4!

1.Bxe6! th. 2.h8S th. 3.Sf7#
1...Sc7,Sb4 a 2.Sd7+ B Ke4 3.Sxc5#
1...Rxb6 b 2.Sg4+ C Ke4 3.Sxf2#
1...Qxg3 c 2.Sxh5+ D Ke4 3.Sxg3#
1...Rxd6 d 2.Se8+ A Ke4 3.Sxd6#

Beautiful 4-fold Lacny cycle with quiet 2nd moves by Yossi Retter.