411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...c6/2. d4/2...d5/3. f3/3...dxe4/4. fxe4/4...e5/5. Nf3/5...Bg4
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Caro–Kann Defence: Fantasy Variation Tartakower VariationMaróczy Variation
5...Bg4 · Fantasy Variation
6. Bc4, attacking f7, is the most common response, and it's the line that forces Black to walk a tightrope to avoid tactical disaster. If Black knows the theory, the line leads to complete equality. 6. c3 is probably the best objective try for White against knowledgeable Black opponents.
Theory table
6. Bc4 6. c3
References