Chess Opening Theory/1. e4/1...e5/2. f4/2...f5

= Panteldakis Countergambit = Among the oldest countergambits in the King's Gambit Declined is the Panteldakis Countergambit, 1.e4 e5 2.f4 f5?!, known from a game played in 1625 in which Gioachino Greco used it to win with the Black pieces. It is nonetheless considered dubious because 3. exf5 with the threat of Qh5+ gives White a good game.

Theory table
1.e4 e5 2.f4 f5