411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e6/2. d4/2...d5/3. Nc3/3...Bb4/4. Bd2/4...dxe4
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Fingerslip variation C15 Fingerslip variation
4...dxe4
White's pawn is practically gambited, since the immediate recapture 5. Nxe4?! loses another pawn to 5...Qxd4, giving up the advantage to Black.
With no way to recapture the pawn yet, White must play actively: /5. Qg4/ is the best way to do so. White prepares to castle queenside quickly while pressuring Black's kingside.
Theory table
5. Qg4 Nf6 6. Qxg7 Rg8 7. Qh6 Kunin double gambit 5. ... Qxd4 6. O-O-O
References
See also
French Defence White's_fourth_move_alternatives