Queen's Gambit Accepted - Smyslov Variation
The Smyslov Variation was developed by World Chess Champion Vasily Smyslov and used in top level competitions by him and by other World Champions. One advantage is that it can be used frequently. If White plays 1. d4 and Black responds with 1. ...d5, White will almost always play 2. c4. Then after the natural moves 2. ...dxc4 3. Nf3 Nf6 4. e3, Black can play 4. ...g6 which is the Smyslov Variation. The Smyslov Variation is a form of the Queen's Gambit Accepted.