411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...c6/2. d4/2...d5/3. f3/3...dxe4/4. fxe4/4...e5
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Caro–Kann Defence: Fantasy Variation Tartakower VariationMaróczy Variation
4...e5 · Fantasy Variation
Striking back in the centre, and threatening both to take the pawn, as well as Qh4+. Nf3 is the only move for White that both avoids disaster and maintains the pressure.
Theory table
5. Nf3
References