Sicilian - Smith-Morra gambit - 2...cxd4 3.c3
1. e4 c5 2. d4 cxd4 3. c3
White advances the king's pawn to e4. Black moves the c-pawn to c5. White pushes the queen's pawn to d4.
Black captures on d4 with the c-pawn. White pushes the c-pawn to c3.