411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bc4/3...Bc5/4. b4/4...Bxb4/5. c3/5...Be7
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Evans Gambit Accepted: Anderssen Variation
5...Be7 (Evans Gambit Accepted: Anderssen Variation)
Black retreats their bishop to the safest square. White usually plays /6. d4/, taking the full center and attacking Black's pawn on e5.