El Columpio Defense, El Columpio Gambit

The El Columpio Gambit, also called the Swing Gambit, is White's 6. e6 after 4. d4 d6 5. h3 Nh6. It replaces the Exchange Variation, 6. exd6, and the Pin Variation, 6. Bb5, which are considered good for White. The pawn on e6 can be captured by the f-pawn or the c8-bishop. In return White aims to loosen Black's kingside and hinder Black's development. Theory marks the gambit as dubious, though it has been suggested as worth exploring.