Herbert Garn
1.Sfd3 threat 2.g4+ hxg4 3.fxg4 or hxg4. If 1...Rg2 2.Sf2+ Rc2 3.Sce4 threat 4.Rxf6 with two variations,
3...Rxc6 4.Sc5 and 3...Be6 4.Sd6. If 1...Be3+ 2.Kxh5 (threat 3.g4) Rg2 3.g4+ Rxg4 4.fxg4 or hxg4.
Consecutive manoeuvres where a knight unpins a rook which then plays a defence, only to be shut off by
a switchback.