King's Gambit Declined: Falkbeer Countergambit, Staunton Line is a chess opening with the ECO code C31, part of the King's Gambit Declined family. It goes 1. e4 e5 2. f4 d5 3. exd5 e4. White opens with 1. e4 (the king's pawn) and Black answers 1... e5. After 6 moves it is White to move. After the last move White is a pawn ahead in material. The lesson on the board explains every move of the line and lets you play it yourself; it is free.
In chessGM's opening book this position continues with 4. d3.
After 1.e4 e5 2.f4, Black refuses the pawn, usually with 2...Bc5 or 2...d5. This avoids White's main attacking lines.
chessGM has a full course for this line: open the King's Gambit Declined: Falkbeer Countergambit, Staunton Line course lesson.