Bird - From gambit - Lasker variation
1. f4 e5 2. fxe5 d6 3. exd6 Bxd6 4. Nf3 g5
White moves the f-pawn to f4. Black pushes the king's pawn to e5. White captures on e5 with the f-pawn.
Black moves the queen's pawn to d6. White captures on d6 with the king's pawn. Black develops the dark-squared bishop to d6.
White develops the knight to f3. Black advances the g-pawn to g5.