Yusupov-Rubinstein System is a chess opening with the ECO code A46. It goes 1. d4 Nf6 2. Nf3 e6 3. e3. White opens with 1. d4 (the queen's pawn) and Black answers 1... Nf6. After 5 moves it is Black to move. The lesson on the board explains every move of the line and lets you play it yourself; it is free.