Ruy Lopez: Berlin Defense

1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O

Ruy Lopez: Berlin Defense is catalogued under ECO code C65. It is reached after 4 moves (7 half-moves): 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O. After the last move it is Black to play. White opens 1. e4. It is a named variation of the Ruy Lopez, which has 235 catalogued lines in total.

Position shown after the last move; Black to play.