Try: 1.Se7? (thr. 2.Sg6#) but 1...Be6+! and white is forced to play 2.Sd5 diverting the wS from its plan while allowing the bB to play strong defences (including 2…Bxd5#). Key: 1.Bf4! exf4 2.Se7 Be6+ 3.Kd4 Bf5 4.Sxf5 any 5.Se7 any 6.Sg6#
A logical problem with a hidden sacrificial key.
