411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bc4/3...Nf6/4. O-O
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Two Knights Defence rd bd qd kd bd rd pd pd pd pd pd pd pd nd nd pd bl pl nl pl pl pl pl pl pl pl rl nl bl ql rl kl
Italian Game, Two Knights Defence
4. O-O
White sacrifices a pawn for a lead in development and king safety. This is not the soundest line in the Italian Game, but completely playable.
1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. O-O
References
Two Knights Defence
The Two Knights Defence (1983) Yakov Estrin. 0-7134-3991-2.