Valentin Rudenko

Set play:
1...d6 2.Sf8+ Kf4 3.Se6#
1...Qd4 2.Sh4+ Kf4 3.Sg2#
1...Rxf3 2.Se7+ Kf4 3.Sxd5#

Solution:
1.Bg5! th. 2.Rf6+
1...d6 2.Se7+ Ke5 3.Sc6#
1...Qd4 2.Sf8+ Ke5 3.Sxd7#
1...Rxf3 2.Sh4+ Ke5 3.Sxf3#

Lacny theme in threemover for the first time!

Tries:
1.Qxc6+? Sbxc6!
1.Qd5+? Sbxd5!
1.Qd3+? Sxd3!
1.Qxb4+? Qxb4!

1.Ba2! th. 2.Bb1+ Rxb1 3.Sxf2#
1...Qxa2 2.Qxc6+ Sxc6 3.Sd6#
1...Qxc3 2.Qd5+ Sxd5 3.Sd6#
1...Qa4 2.Qd3+ Sxd3 3.Sd6#
1...Qa6 2.Qxb4+ Qc4 3.Sd6#

Note well motivated dual avoidance in all 4 variations as abstract removing of bQ allows all 4 answers, but concrete defence defends simultaneously threat and 3 white moves by queen.

Tries:
1.f3! th. 2.Rc6+ Kd5 3.Bc4#
1...Rb5 2.Sb7+ Kc4 3.Sa5+ Kc5 4.Sd7#
1...Bb5 2.Sd7+ Kc4 3.Sxe5+ Kc5 4.Sb7#
1...e4 2.f4! Rb5 3.Sd7+ Kc4 4.Rd4#, 2...Sb5 3.Sb7+ Kc4 4.Rd4#

Grimshaw in 1st Black move is exploited only on 4th white move - here organically works threat that ends by mate in 3rd white move. Grimshaw in 2nd black move is expoited in 3rd white move. Note airy position!

Tries:
1.e4? Sd7! 2.Sg4+ hxg4 3.e5 Sxe5!
1.Sg4+ hxg4! 2.Re5 Bd7 3.Rf5 Sxf5

1.d4! th. 2.Sd7+ Bxd7 3.e4 ~ 4.e5#, 2...Sxd7 3.Re5 Sxe5 4.dxe5#
1...Bd7 2.e4! ~ 3.Sg4+ hxg5 4.e5#
1...Sd7 2.Sg4+ hxg4 3.Re5! Sxe5 4.dxe5#

Thematical tries become variations only after defences to the threat square.