1...f1=N+ 0-1. Black saves the new queen after 2.Kg2 Qxg3+, or 2.Nxf1 Re2+ 3.Qxe2 Qxe2+.

1.Rh8+! Kxh8 2.f7+ 1-0. On 2...Kh7 3.f8=N+, otherwise 2...Qg7/Rg7 3.f8=Q+ wins.

A stock opening trap - Black wins with 1...exf2+ 2.Ke2 fxg1=N+! 3.Rxg1 Bg4+ winning the queen.

Mate in Four = 1...Nf2+ 2.Bxf2 gxf2 3.Kxh2 f1=R 4.Kh3 Rh1#.

1.f8=R 1-0. Instead 1.f8=Q? Rf6+! leads to stalemate.

1.Rb8 Rxb8 2.axb8=B! 1-0. Also correct is 2.axb8=N! and White wins.