Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bb5/3...a6/4. Ba4/4...Nf6/5. O-O/5...Bc5

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).