411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e6/2. d4/2...d5/3. Nc3/3...Nf6
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Classical variation Paulsen variation
3...Nf6 · Classical variation
Both players engage a fight for the center. Tension will increase even more after /4. Bg5/ unless White wants to directly block the pawn structure and win a tempo by attacking the newly developed knight with /4. e5/.
Theory table
Classical variation 4. Bg5 Be7 Steinitz variation 4. e5 Nfd7
References
French Defence Classical Variation: 3.Nc3 Nf6