Sicilian - 2.c3 - Heidenfeld variation
1. e4 c5 2. c3 Nf6 3. e5 Nd5 4. Nf3 Nc6 5. Na3
White moves the king's pawn to e4. Black pushes the c-pawn to c5. White plays the c-pawn to c3.
Black develops the knight to f6. White plays the king's pawn to e5. Black moves the knight to d5.
White develops the knight to f3. Black transfers the knight to c6. White moves the knight to a3.