En passant
When a Pawn makes a double step from its initial square it can be captured by the opponent's Pawn on the adjacent file next to it. The right to capture expires if not used immediately.
Zezza, Isidoro
Carrà, Arturo
2nd FIDE Tournament, 1959
1st Prize
h#5 (3+10)
1.0-0-0
Ka2
2.b1=R
Se4
3.Sc7+
c4
4.bxc3 e.p.+
Ka3
5.Rb8
Sd6#