411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e6/2. d4/2...d5/3. Nd2/3...Nf6/4. e5/4...Nfd7/5. Bd3/5...c5/6. c3
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Closed Tarrasch C05 French defence → Tarrasch → Closed Tarrasch → 5...c5
6. c3
White reinforces their pawn chain.
6...Nc6 increases the pressure on d4, and Black can also add an attacker with ...Qb6. White can choose to defend it with 7. Ne2, meeting 7...Qb6 with 8. Nf3, or gambit it with 7. Ngf3.
6...b6, the Botvinnik variation, prepares to trade off Black's bad bishop for White's good one.
Theory table
1.e4 e6 2.d4 d5 3.Nd2 Nf6 4.e5 Nfd7 5.Bd3 c5 6.c3
6
Main line
6...Nc6
=
References
See also
French Defence