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.

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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.

The Caro-Kann: How to Play It as White and Black - Chessable Blog