411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bc4/3...Nf6/4. Ng5/4...Bc5/5. Bxf7/5...Ke7/6. Bd5/6...Rf8/7. O-O
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Traxler Counterattack
This is the natural move, defending the f2-pawn. White's king, however, has now committed to the kingside, which can bring some tactical possibilities to Black's play.
Theory table
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1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 Bc5 5. Bxf7+ Ke7 6. Bd5 Rf8
References
Two Knights Defence