E01-E09 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Catalan, closed

├── E01 - 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 - Catalan Opening: Closed (8)
├── E02 - 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 - Catalan Opening: Open Defense (0)
├── E03 - 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Qa4+ Nbd7 6. Qxc4 - Catalan Opening: Open Defense (0)
├── E04 - 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Nf3 - Catalan Opening: Open Defense (17)
├── E05 - 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Nf3 Be7 - Catalan Opening: Open Defense, Classical Line (30)
├── E06 - 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 - Catalan Opening: Closed (20)
├── E07 - 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 - Catalan Opening: Closed (0)
├── E08 - 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O c6 7. Qc2 b6 8. Rd1 Nbd7 9. Bf4 - Catalan Opening: Closed (1)
├── E08 - 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 - Catalan Opening: Closed (2)
└── E09 - 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Be7 5. Bg2 O-O 6. O-O Nbd7 7. Qc2 c6 8. Nbd2 - Catalan Opening: Closed, Main Line (0)