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...Bd6
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Evans Gambit Accepted: Stone-Ware Variation
5...Bd6
Black retreats their bishop to d6, defending the e5 pawn so d4 doesn't come with an attack on the pawn, but at the cost of blocking the d7 pawn. White usually plays /6. d4/ taking the center.