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...Bc5
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Ruy López Opening: Morphy Defense, Møller Variation
Black develops the bishop before playing 5...b5. This allows 6.c3 b5 7.Bc2 and 6.Bxc6. White could also continue to play 6.d3, transposing to the Anderssen Variation (5.d3).