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Chess Opening Theory/1. e4/1...e5/2. Bc4/2...Bc5/3. Qg4/3...Qf6/4. Nf3

4. Nf3

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Bishop's Opening - 3. Qg4!? Sideline, 3...Qf6, 4. Nf3
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Position in Forsyth-Edwards Notation (FEN)
Moves: 1. e4 e5 2. Bc4 Bc5 3. Qg4 Qf6 4. Nf3

Objectively White's best move, 4. Nf3 blocks the bishop and queen's double attack on f2 and develops a piece. Here Black usually plays 4...Nc6 developing a piece and preparing ...Nd4 themselves (this is long-term as the knight on f3 currently defends d4), and the position is roughly equal, although White could have had a more fun game if 4. Nc3!? was tried instead...