Polish Defense: Spassky Gambit Accepted is a chess opening with the ECO code A40, part of the Polish Defense family. It goes 1. d4 b5 2. e4 Bb7 3. Bxb5. White opens with 1. d4 (the queen's pawn) and Black answers 1... b5. After 5 moves it is Black 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.