I am a beginner in the Caro-Kann and wanted to know why in the first diagram, bd3 is an inaccuracy while bd3 is the second most popular move in the second diagram.

Theoretically, why is 4. Bd3 not one of the best candidates in Caro Kann (opening, caro kann, bishops, bad bishop, exchange, chess)? - Quora

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Theoretically, why is 4. Bd3 not one of the best candidates in Caro Kann (opening, caro kann, bishops, bad bishop, exchange, chess)? - Quora

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