411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. f4/2...exf4/3. Nf3/3...Be7/4. Bc4
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King's Gambit, Cunningham-Euwe Variation rd nd bd qd kd nd rd pd pd pd pd bd pd pd pd bl pl pd nl pl pl pl pl pl pl rl nl bl ql kl rl
This bishop move places the bishop on a fine diagonal, helps control d5 and eyes f7. In the case of the check on h4, the king can sidestep to f1.
G3?! leads to the Bertin Gambit. While White has very significant compensation, Black is better with best play.