411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bc4/3...Nf6/4. Ng5/4...Nxe4/5. Nxf7
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Two Knights Defence rd bd qd kd bd rd pd pd pd pd nl pd pd nd pd bl nd pl pl pl pl pl pl pl rl nl bl ql kl rl 1. e4 e5 2. Nf3 Nc6 3. Nc4 Nf6 4. Ng5 Nxe4 5. Nxf7 C57-C59 Italian Game
Two Knights Defence
5. Nxf7?
White takes with their knight, forking the Black queen and rook. This is inferior to capturing with the bishop because Black can create counterplay with the strong move Qh4, threatening checkmate. Here, White's only defense is 6. Qe2 and Black can force a queen trade with 6... Nd4 7. g3 Nxe2 8. gxh4 Nd4
Even after the White knight finally captures the rook with 9. Nxh8, Black has a fork of their own on c2, and with 10. Ke2, the game continues on without any advantage for White.
References
Two Knights Defence