Latvian Gambit is a chess opening with the ECO code C40. It goes 1. e4 e5 2. Nf3 f5. White opens with 1. e4 (the king's pawn) and Black answers 1... e5. After 4 moves it is White to move. The lesson on the board explains every move of the line and lets you play it yourself; it is free.
The moves
1. e4 – White plays the pawn to e4
1... e5 – Black plays the pawn to e5
2. Nf3 – White plays the knight to f3
2... f5 – Black plays the pawn to f5
About the Latvian Gambit
After 1.e4 e5 2.Nf3, Black plays the risky 2...f5. It is like a King's Gambit for Black, but a tempo down, so it is objectively dubious.
Black wants to open the f-file and attack fast.
White's strong reply is 3.Nxe5, hitting e5 and eyeing Qh5+.
The e8-h5 diagonal is weak for Black; watch for Qh5+ tricks.
chessGM