1.Sb6 ? threat: 2.Rd5 # (A)

1...S:c5 (a) 2.Bc3 # (B)

1...d:c5 2.Bc3 #

but 1...d5 ! (b)

1.Rg5 ? threat: 2.Bc3 # (A)

1...d5 (b) 2.Rg4 # (C)

but 1...f5 !

1.Rh5 ? threat: 2.Bc3 #

1...d5 (b) 2.Rh4 # (D)

1...f5 !

1.Rf5 ! threat: 2.Bc3 # (B)

1...Sc5 (a) 2.Rd5 # (A)

1...d5 (b) 2.Rf4 # (E)

Le Grand ([A]aB-[B]aA),

Changed mates

Kharkiv-2