Nimzo-Indian Defense: Classical Variation, 4…O-O
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O
Main Transpositions
Most Popular
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6 7. Bg5 Bb7 (743/M). More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6 7. Bg5 (966/M). More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6 (1189/M). More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 (1949/M). More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ (1965/M). More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 (1979/M). More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. Nf3 (569/M). More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O (3121/M). More: dbcn ccoe c365
TCEC Games
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6 7. Bg5 Bb7 8. f3 h6 (1cp, 229/M, TCEC +0=0-1). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6 7. Bg5 Bb7 8. f3 d6 (2cp, 43/M, TCEC +0=4-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6 7. Bg5 Bb7 8. f3 c5 (1cp, 24/M, TCEC +0=2-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6 7. Bg5 Bb7 8. Nf3 d6 9. Nd2 Nbd7 10. f3 d5 (6cp, 3/M, TCEC +0=0-1). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6 7. Bg5 Bb7 8. Nf3 c5 (2cp, 5/M, TCEC +1=0-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6 7. Bg5 Ba6 8. e3 d6 (4cp, 46/M, TCEC +2=0-1). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6 7. Bg5 Ba6 8. Qf3 Nc6 (15cp, 27/M, TCEC +1=5-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6 7. Bg5 Ba6 8. Nf3 d6 (8cp, 15/M, TCEC +0=2-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6 7. Bg5 Ba6 8. g3 d5 (0cp, 0/M, TCEC +0=0-1). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6 7. Bg5 h6 8. Bh4 Bb7 (1cp, 37/M, TCEC +1=1-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6 7. Bg5 h6 8. Bh4 c5 (2cp, 7/M, TCEC +1=4-2). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6 7. Bg5 c5 8. dxc5 bxc5 (1cp, 47/M, TCEC +1=3-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6 7. Nf3 Bb7 8. e3 d6 (1cp, 86/M, TCEC +0=2-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6 7. Nf3 Bb7 8. e3 h6 (9cp, 5/M, TCEC +0=1-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6 7. Nf3 Bb7 8. g3 d5 (0cp, 11/M, TCEC +1=0-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6 7. Nf3 Bb7 8. g3 Qe7 (9cp, 2/M, TCEC +0=0-1). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6 (0cp, 1189/M, TCEC +3=12-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 d5 (0cp, 259/M, TCEC +1=0-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 d6 7. f3 Qe8 8. e4 (-94cp, 8/M, TCEC +1=1-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 d6 7. f3 Qe8 (93cp, 13/M, TCEC +2=6-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 Ne4 7. Qc2 f5 8. Nh3 d6 (33cp, 28/M, TCEC +1=0-1). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 Ne4 7. Qc2 f5 8. Nf3 b6 (7cp, 28/M, TCEC +1=3-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 Ne4 7. Qc2 f5 8. g3 b6 (6cp, 18/M, TCEC +1=3-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 Ne4 (8cp, 161/M, TCEC +0=2-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b5 (4cp, 110/M, TCEC +0=4-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ (0cp, 1965/M, TCEC +0=2-2). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. Nf3 d5 6. a3 Bxc3+ (0cp, 27/M, TCEC +1=0-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. Nf3 b6 (103cp, 105/M, TCEC +2=1-1). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. Nf3 Nc6 6. Bd2 Re8 7. a3 Bf8 8. e3 d6 (82cp, 0/M, TCEC +1=1-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. e4 d5 6. e5 Ne4 (1cp, 190/M, TCEC +1=1-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. e4 d6 6. a3 Bxc3+ 7. bxc3 e5 8. Bd3 c5 (57cp, 9/M, TCEC +0=1-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. e4 d6 6. e5 dxe5 7. dxe5 Ng4 8. Nf3 Nc6 (18cp, 9/M, TCEC +0=1-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. e4 d6 6. Bd3 Nc6 7. Ne2 e5 8. d5 Nd4 (100cp, 1/M, TCEC +2=2-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. e4 d6 6. Bd3 Nc6 7. Ne2 Ba5 8. a3 Bb6 (2cp, 1/M, TCEC +0=1-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. e4 d6 6. Bd3 Nc6 (8cp, 7/M, TCEC +0=1-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. e4 Bxc3+ 6. bxc3 d6 (80cp, 13/M, TCEC +7=5-0). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. Bg5 h6 6. Bh4 c5 7. e3 cxd4 8. exd4 Nc6 (-1cp, 10/M, TCEC +0=0-1). Games. More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O (0cp, 3121/M, TCEC +0=2-0). Games. More: dbcn ccoe c365
Biased Popular Lines
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6 7. Bg5 Bb7 8. f3 h6 9. Bh4 d5 10. e3 Nbd7 11. cxd5 exd5 12. Bd3 Re8 (71cp, -14cp; 14/M, 65%). More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 d6 7. f3 Qe8 (84cp, -82cp; 13/M, 49%). More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 Ne4 7. Qc2 f5 8. Nh3 b6 9. f3 Nf6 10. e3 Bb7 (98cp, -47cp; 9/M, 108%). More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 Ne4 7. Qc2 f5 8. e3 b6 9. Ne2 Bb7 (75cp, -34cp; 12/M, 96%). More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 Ne4 7. Qc2 f5 8. e3 b6 9. Bd3 Bb7 (76cp, -58cp; 12/M, 103%). More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Be7 (67cp, -67cp; 13/M, 0%). More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. Nf3 b6 6. e4 d5 7. e5 Ne4 8. Bd3 Bb7 (200cp, -10cp; 13/M, 88%). More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. Nf3 b6 6. e4 d5 (190cp, -84cp; 21/M, 43%). More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. Nf3 b6 6. e4 Bb7 (134cp, -28cp; 14/M, 30%). More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. Nf3 b6 (106cp, -106cp; 105/M, 18%). More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. e4 Bxc3+ (82cp, -83cp; 15/M, 4%). More: dbcn ccoe c365
Lines with Disagreement to Human Master Play
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 d6 7. f3 Qe8 (84cp, -82cp; 13/M, 49%). More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Be7 6. e4 d6 (127cp, -73cp; 6/M, 68%). More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. Nf3 d5 6. a3 Be7 (62cp, -62cp; 17/M, 55%). More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. Nf3 b6 6. e4 d5 (190cp, -84cp; 21/M, 43%). More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. Nf3 b6 6. e4 Bb7 7. Bd3 d5 (200cp, -66cp; 6/M, 44%). More: dbcn ccoe c365
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. e4 c5 6. e5 cxd4 7. a3 dxc3 (150cp, -120cp; 6/M, 51%). More: dbcn ccoe c365
Latest dbcn data: 2025-12-19