Slav Indian: Kudischewitsch Gambit is a chess opening with the ECO code A40, part of the Slav Indian family. It goes 1. d4 c6 2. Nf3 Nf6 3. c4 b5. White opens with 1. d4 (the queen's pawn) and Black answers 1... c6. After 6 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.