Helpmate and a few fairies from The Problemist Nov 2000

1.Rxc5 Sf4 2.Kxe4 Sxh3 3.Kf3 Sg5#

1.Rxd3 Bg6 2.Kxc5 b4+ 3.Kc6 Be8#

1.dxe4 Sa6 2.Kxd3 h5 3.Sd4 Sb4#

Excellent formal theme - cyclical annihilation of two white pieces by various black pieces in first move and black king in second move, remaining white piece gives model mate. Position is heavy, with many white pawns, but I consider it to be reasonable. Very good example for 3rd TT Pat a Mat.

1.Rc8(Ib7) Rg5(Ih7) 2.Re2(Ih1) Rxa3(Ib1)#

Round trip of imitator is carried out by movements of 4 rooks. Original idea, I think.

1.Rb6! th. 2.Rh1! g1Q/R#
1...Bf1 2.Rb8 Rb7#
1...Rxh4 2.Qh7 Qg6#

Three analogical mates - white line mover makes move over the square from which black sets mate using the white piece as contact.

1.Kf2! th. 2.PAh5#
1...VAa4 (VAd7, VAe8) 2.LEf1#
1...VAf1 2.LEg2#
1...VAe2 2.Kf3#
1...VAd3 2.PAe4#
1...VAc4 2.PAd5#
1...VAxg3 (VAe7) 2.PAc6#
1...c4 2.PAe1#
1...h5 2.LExh7#
1...hxg5 2.PAh6#

5 antibattery mates on 5 different squares of b7-h1 line.

1.Qe4! th. 2.Qxe5#
1...Bb8, Bc7, Bd6, Bh2, Bg3, Bf4, Bb2, Bc3, Bd4, PAe1
2.Se8#, Qe7#, Qe6#, Qxh4#, Qg6#, Qf5#, PAf2#, Qxc6#, Qxd4#, Qg6#

8 interferences of paos.

1.Rc8 Be6 2.Rc2 Kb1 3.Rb2+ Kc1 4.Rc2+ Kd1 5.Re2 Bh3 6.Rd2+ Ke1 7.Re2+ Kf1 8.Rh2 Bg2#

It isn't simple to collect all "sheeps" into one corner to reach the mate - moving piece must always be attacked by enemy. So wB and bR must collaborate to push wK right way.

1.Sd6? th. 2.c6#
1...Bc6 2.Qe6#
1...Bg2!

1.c6! th. 2.Qe6#
1...Bc6 2.Sd6#

Djurasevic cycle - cycle of key, threat and mate after the same defence. Motivation is not complicated, but it nicely uses Beamtenschach effects.