1. Main line 1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Nc3 dxc4 5. e4 Choose a line 1. Main line 1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Nc3 dxc4 5. e4 2. Bogoljubow Defense 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. Nc3 a6 5. e4 3. Gunsberg Defense, Prianishenmo Gambit 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. Nc3 c5 5. d5 e6 6. e4 exd5 7. e5 4. Showalter Variation 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. Nc3 Close 1. Main line 1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Nc3 dxc4 5. e4 2. Bogoljubow Defense 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. Nc3 a6 5. e4 3. Gunsberg Defense, Prianishenmo Gambit 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. Nc3 c5 5. d5 e6 6. e4 exd5 7. e5 4. Showalter Variation 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. Nc3 Next