Blumenfeld counter-gambit - Dus-Chotimursky variation
1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 b5 5. Bg5
White pushes the queen's pawn to d4. Black develops the knight to f6. White pushes the c-pawn to c4.
Black advances the king's pawn to e6. White develops the knight to f3. Black moves the c-pawn to c5.
White moves the queen's pawn to d5. Black advances the b-pawn to b5. White develops the dark-squared bishop to g5.