411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bb5/3...a6/4. Ba4/4...Nf6/5. O-O/5...Be7/6. Re1/6...b5/7. Bb3/7...d6/8. c3
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Ruy Lopez Main Line rd bd qd kd rd pd bd pd pd pd pd nd pd nd pd pd pl bl pl nl pl pl pl pl pl pl rl nl bl ql rl kl Ruy Lopez
Ruy Lopez Main Line
With White preparing to strike in the centre with d4, Black's king typically vacates the premises with 8...O-O. The old-fashioned move is 8...Na5, which may transpose, but the loss of control over d4 may allow White to save a tempo by omitting h3.
8...Bg4 is seen from time to time, discouraging an instant d4 by White. White will probably play d3 as a temporary measure, aiming to bring the queens knight to the kingside to evict the bishop in order to achieve d4.
Ruy Lopez
References
fi:Shakkiaapinen/Peli/1. e4/1...e5/2. Rf3/2...Rc6/3. Lb5/3...a6/4. La4/4...Rf6/5. 0-0/5...Le7/6. Te1/6...b5/7. Lb3/7...d6/8. c3