Beefeater defence
1. d4 g6 2. c4 Bg7 3. Nc3 c5 4. d5 Bxc3+ 5. bxc3 f5
White moves the queen's pawn to d4. Black pushes the g-pawn to g6. White pushes the c-pawn to c4.
Black develops the dark-squared bishop to g7. White develops the knight to c3. Black pushes the c-pawn to c5.
White pushes the queen's pawn to d5. Black captures with the dark-squared bishop on c3, giving check. White captures on c3 with the b-pawn.
Black plays the f-pawn to f5.