Solution: 1.Be2! Ba4! 2.Sc6 Bxc6 3.dxc6 Kd5 4.Bb5 Ke4 5.h3 Kd5 6.Kf5 f6 7.c4# 5…Kf3 6.Bf1 Ke4 7.Bg2# 2…Bb5 3.Bxb5 Kf3 4.Bf1 Kg4 5.Se5+ Kh4 6.Bg5+ Kh5 7.Be2#
Strategic moremover to begin, transitioning then into a zugzwang position when the black Siegfried bishop’s role is exhausted. Two model mates, 3 dual-free variations. Switchback for mate, with the black king mated on the white bishop's start square in the switchback.All white pieces move in the solutions; only the f2 pawn remains stationary. Be2/Bg2 mates also provide an interesting geometry.
