Lasker Trap

Promote to a knight on move seven — the earliest underpromotion in serious opening theory.

Albin Countergambit — White falls in with e3

Trap data: Wikipedia — Albin Countergambit, Lasker Trap (CC BY-SA 4.0); Lichess chess-openings (Queen's Gambit Declined: Albin Countergambit, Lasker Trap, ECO D08) (CC0-1.0).