411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. d4/2...exd4/3. c3/3...dxc3/4. Bc4/4...cxb2
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Double Danish Accepted rd nd bd qd kd bd nd rd pd pd pd pd pd pd pd bl pl pl pd pl pl pl rl nl bl ql kl nl rl
Double Danish Gambit Accepted
This time White has to recapture the pawn with 5. Bxb2 rather than give Black a second queen. (The sacrifice Bxf7 is an important idea in the Double Danish Accepted, just not yet.)