411 REFERENCE · Wikibooks
Chess Opening Theory/1. d4/1...d5/2. Nc3/2...c6
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Chigorin defence Chigorin defence D00
2...c6
A minor sideline that offers White the chance to transposition into a Caro-Kann defence with 3. e4.
If White continues with a Rapport-Jobava London style set-up, 3. Bf4, which is the second most common move, then Black's pawn on ...c6 serves the purpose of preventing Nb5.
References