Sicilian - wing gambit - Marienbad variation
1. e4 c5 2. b4 cxb4 3. a3 d5 4. exd5 Qxd5 5. Bb2
White moves the king's pawn to e4. Black plays the c-pawn to c5. White advances the b-pawn to b4.
Black captures on b4 with the c-pawn. White advances the a-pawn to a3. Black plays the queen's pawn to d5.
White captures on d5 with the king's pawn. Black captures with the queen on d5. White develops the dark-squared bishop to b2.