1. Main line 1. d4 e6 2. c4 Bb4+ Choose a line 1. Main line 1. d4 e6 2. c4 Bb4+ 2. Keres Defense, Transpositional Variation 1. d4 e6 2. c4 Bb4+ 3. Nc3 Close 1. Main line 1. d4 e6 2. c4 Bb4+ 2. Keres Defense, Transpositional Variation 1. d4 e6 2. c4 Bb4+ 3. Nc3 Next