411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...c6/2. d4/2...d5/3. e5/3...c5/4. c3/4...cxd4
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Caro-Kann Defense - Advance Variation - Botvinnik-Carls Defense rd nd bd qd kd bd nd rd pd pd pd pd pd pd pd pl pd pl pl pl pl pl pl rl nl bl ql kl bl nl rl
Caro-Kann - Botvinnik-Carls Defense - 4. c3 cxd4
Black's second most popular response to the move 4. c3 in the Botvinnik-Carls Defense. It is not the best move, as it is better for black to have added more pressure to the d4 pawn first before taking.
References
Caro-Kann