Benoni - 6.e4
1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4
White plays the queen's pawn to d4. Black develops the knight to f6. White advances the c-pawn to c4.
Black pushes the c-pawn to c5. White plays the queen's pawn to d5. Black moves the king's pawn to e6.
White develops the knight to c3. Black captures on d5 with the king's pawn. White captures on d5 with the c-pawn.
Black pushes the queen's pawn to d6. White plays the king's pawn to e4.