411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e6/2. d4/2...d5/3. e5/3...c5/4. c3/4...Nc6
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French Defence: Advance Variation C02
4...Nc6
Here White usually decides to overprotect their center-pawns by playing /5. Nf3/. In a few games, and for the same purpose, White players have also tried /5. Be3/ and /5. f4/.
Theory table
all Main Line 5. Nf3 Qb6 6. Be2 cxd4 5. Be3 Qb6 5. f4 Nh6
References
French Defence