I play the Caro–Kann Defence against 1.e4 as black, and for whatever reason it feels like I get the following line way too frequently:
1.e4 c6 2.d4 d5 3. exd5 cxd5 4. Nc3?!
This line is a "non-critical" line, so much so that I just got an opening book on the Caro-Kann and there are a whopping 0 lines that discuss how to play against this setup. It's very rarely played in the masters databases, but on lichess.org it's the 4th most common move in this position, and you can also reach the same position by playing
1.e4 c6 2.Nc3 d5 3.exd5?! cxd5 4.d4 which isn't too uncommon.
Similar to the c3 knight in the Richter–Veresov Attack or the "Jobava" London, mostly I just see people dismissing this knight, claiming off-hand that it's bad, that it "doesn't belong there". But for whatever reason, when I look at my results in the different lines in the Exchange Variation, this is my worst line! I'm probably running into problems with a small sample size, but I'm wondering if anyone has any general tips for how to make white feel this "bad knight".