Elephant Gambit: Paulsen Countergambit is a chess opening with the ECO code C40, part of the Elephant Gambit family. It goes 1. e4 e5 2. Nf3 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.