Ruy Lopez: Morphy Defense

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O

Ruy Lopez: Morphy Defense is catalogued under ECO code C78. It is reached after 5 moves (9 half-moves): 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 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. 3 deeper lines continue from here, listed below.

Position shown after the last move; Black to play.