411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...c6/2. d4/2...d5/3. exd5/3...cxd5/4. c4/4...Nf6/5. Nc3/5...Nc6
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Caro-Kann Panov-Botvinnik Attach Caro-Kann
5... Nc6 · Caro-Kann Panov-Botvinnik Attack
5... Nc6 is regarded as the most ambitious, but also risky, response for black. White usually responds with either 6. Nf3 or 6. Bg5 here. 6. cxd5 is also sometimes played, but black can prevent it transposing into the 6. Nf3 line by playing 6... Bf5 instead, which prevents white's later Qb3 with N5b4, exposing white's weakness on c2.
Theory table
6. Nf3 6. Bg5 6. cxd5
References
Caro-Kann
Nunns Chess Openings. 1999. John Nunn (Editor), Graham Burgess, John Emms, Joe Gallagher. 1-8574-4221-0.
Modern Chess Openings: MCO-14. 1999. Nick de Firmian, Walter Korn. 0-8129-3084-3.
Play the Caro-Kann. 2007. Jovanka Houska 9781857447965