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Chess Opening Theory/1. e4/1...c6/2. d4/2...d5/3. e5/3...c5/4. dxc5/4...e6
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Caro-Kann Defence - Advance Variation, Botvinnik-Carls Defence
4... e6 · Caro-Kann Defence - Advance Variation, Botvinnik-Carls Defence
5. Be3 is a common choice, to protect the pawn. Note that 5. b4 is not recommended, as after 5... Nc6 there are too many weaknesses.
Theory table
5. Be3
References
Caro-Kann
Opening Repertiore: The Caro-Kann. 2015. Jovanka Houska 9781781942109