Amsterdam attack
1. e3 e5 2. c4 d6 3. Nc3 Nc6 4. b3 Nf6
White plays the king's pawn to e3. Black pushes the king's pawn to e5. White moves the c-pawn to c4.
Black pushes the queen's pawn to d6. White develops the knight to c3. Black develops the knight to c6.
White moves the b-pawn to b3. Black jumps the knight to f6.