411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bc4/3...Bc5/4. d4/4...Bxd4/5. Nxd4
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Italian Gambit
White captures the bishop to open up the d1-h4 diagonal for their queen. Black usually responds with /5...Nxd4/ but /5...exd4/ is a sound alternative.