Budapest - Alekhine - Abonyi variation
1. d4 Nf6 2. c4 e5 3. dxe5 Ng4 4. e4 Nxe5 5. f4 Nec6
White moves the queen's pawn to d4. Black develops the knight to f6. White plays the c-pawn to c4.
Black moves the king's pawn to e5. White captures on e5 with the queen's pawn. Black jumps the knight to g4.
White plays the king's pawn to e4. Black captures with the knight on e5. White moves the f-pawn to f4.
Black moves the knight to c6.