Three knights - Steinitz - Rosenthal variation
1. e4 e5 2. Nf3 Nc6 3. Nc3 g6 4. d4 exd4 5. Nd5
White plays the king's pawn to e4. Black plays the king's pawn to e5. White develops the knight to f3.
Black develops the knight to c6. White moves the knight to c3. Black pushes the g-pawn to g6.
White advances the queen's pawn to d4. Black captures on d4 with the king's pawn. White moves the knight to d5.