Four knights - Rubinstein counter-gambit - exchange variation
1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Nd4 5. Nxd4
White plays the king's pawn to e4. Black pushes the king's pawn to e5. White develops the knight to f3.
Black develops the knight to c6. White transfers the knight to c3. Black transfers the knight to f6.
White develops the light-squared bishop to b5. Black jumps the knight to d4. White captures with the knight on d4.