411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...c6/2. d4/2...d5/3. Nc3/3...dxe4/4. Nxe4/4...Bf5/5. Ng5/5...Bg6
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Caro-Kann Defense: Ng5 - Bg6
Bishop retreats to not to be endangered again in the future. The most common response to Ng5.