1. Main line 1. Nf3 Nf6 2. g3 d5 3. Bg2 c6 4. O-O Bf5 Choose a line 1. Main line 1. Nf3 Nf6 2. g3 d5 3. Bg2 c6 4. O-O Bf5 2. Main line, 5... h6 1. Nf3 Nf6 2. g3 d5 3. Bg2 c6 4. O-O Bf5 5. d3 h6 3. Main line, 6... dxc4 1. Nf3 Nf6 2. g3 d5 3. Bg2 c6 4. O-O Bf5 5. d3 h6 6. c4 dxc4 4. Main line, 6. Nbd2 1. Nf3 Nf6 2. g3 d5 3. Bg2 c6 4. O-O Bf5 5. d3 e6 6. Nbd2 5. Main line, 6. Nh4 1. Nf3 Nf6 2. g3 d5 3. Bg2 c6 4. O-O Bf5 5. d3 e6 6. Nh4 Close 1. Main line 1. Nf3 Nf6 2. g3 d5 3. Bg2 c6 4. O-O Bf5 2. Main line, 5... h6 1. Nf3 Nf6 2. g3 d5 3. Bg2 c6 4. O-O Bf5 5. d3 h6 3. Main line, 6... dxc4 1. Nf3 Nf6 2. g3 d5 3. Bg2 c6 4. O-O Bf5 5. d3 h6 6. c4 dxc4 4. Main line, 6. Nbd2 1. Nf3 Nf6 2. g3 d5 3. Bg2 c6 4. O-O Bf5 5. d3 e6 6. Nbd2 5. Main line, 6. Nh4 1. Nf3 Nf6 2. g3 d5 3. Bg2 c6 4. O-O Bf5 5. d3 e6 6. Nh4 Next