E12 - 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 - Queen's Indian Defense: Petrosian Variation

├── E12 - 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 - Queen's Indian Defense: Kasparov-Petrosian Variation (15)
│   ├── E12 - 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 Be7 - Queen's Indian Defense: Kasparov-Petrosian Variation, Marco Defense (1)
│   ├── E12 - 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 d5 (7)
│   │   ├── E12 - 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 d5 6. Bf4 - Queen's Indian Defense: Kasparov-Petrosian Variation, Main Line (1)
│   │   ├── E12 - 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 d5 6. cxd5 Nxd5 - Queen's Indian Defense: Kasparov-Petrosian Variation, Modern Variation (3)
│   │   │   ├── E12 - 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 d5 6. cxd5 Nxd5 7. Bd2 - Queen's Indian Defense: Kasparov-Petrosian Variation, Romanishin Attack (1)
│   │   │   ├── E12 - 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 d5 6. cxd5 Nxd5 7. e3 - Queen's Indian Defense: Kasparov-Petrosian Variation, Petrosian Attack (1)
│   │   │   └── E12 - 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 d5 6. cxd5 Nxd5 7. Nxd5 - Queen's Indian Defense: Kasparov-Petrosian Variation, Modern Variation (1)
│   │   ├── E12 - 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 d5 6. Qa4 - Queen's Indian Defense: Kasparov-Petrosian Variation, Main Line (2)
│   │   └── E12 - 1. d4 Nf6 2. Nf3 e6 3. c4 b6 4. a3 Bb7 5. Nc3 d5 6. Qc2 - Queen's Indian Defense: Kasparov-Petrosian Variation, Main Line (1)
│   ├── E12 - 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 d6 - Queen's Indian Defense: Kasparov-Petrosian Variation (1)
│   └── E12 - 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 Ne4 - Queen's Indian Defense: Kasparov-Petrosian Variation, Andersson Variation (6)
└── E12 - 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 c6 - Queen's Indian Defense: Petrosian Variation (1)