but

1...Se4(a)!

1.S*c5? - 2.Rd3(B)#

1...Se4 (a) 2.Q*e6#

1...B*c5 2.Q*a8#

but

1...e4(b)!

1.e3! - 2.Sc3#

1...e4(b) 2.Rd2(A)# (Rd3?)

1...Se4(a) 2.Rd3(B)# (Rd2?)

1...Ke4 2.Qd3#

1...c4 2.Q*c4#

1...Bb6 2.Q*a8#

Hannelius theme. In the solution - 2 variations with Ventura theme plus antiduals. Ventura theme is anticipatory line closing of a pinned piece what is exploited by the White after its unpinning. - Синтез тем Ханнелиуса и Вентуры.