1. Main line 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 Choose a line 1. Main line 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 2. Euwe Variation 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 c5 5. d5 Ne4 3. Korchnoi Variation 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 c5 5. d5 4. Shocron Gambit 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Nc3 c5 5. d5 b5 Close 1. Main line 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 2. Euwe Variation 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 c5 5. d5 Ne4 3. Korchnoi Variation 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 c5 5. d5 4. Shocron Gambit 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Nc3 c5 5. d5 b5 Next