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ECO CODES
(Click on an opening description to see diagram)

E20 - E59

E20 Nimzo-Indian defence
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4
E20 Nimzo-Indian: Kmoch variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. f2f3
E20 Nimzo-Indian: Mikenas attack
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. d1d3
E20 Nimzo-Indian: Romanishin-Kasparov (Steiner) system
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. g2g3
E21 Nimzo-Indian: three knights variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. g1f3
E21 Nimzo-Indian: three knights, Korchnoi variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. g1f3 c7c5 5. d4d5
E21 Nimzo-Indian: three knights, Euwe variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. g1f3 c7c5 5. d4d5 f6e4
E22 Nimzo-Indian: Spielmann variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. d1b3
E23 Nimzo-Indian: Spielmann, 4...c5, 5.dc Nc6
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. d1b3 c7c5 5. d4c5 b8c6
E23 Nimzo-Indian: Spielmann, Karlsbad variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. d1b3 c7c5 5. d4c5 b8c6
6. g1f3 f6e4 7. c1d2 e4d2
E23 Nimzo-Indian: Spielmann, San Remo variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. d1b3 c7c5 5. d4c5 b8c6
6. g1f3 f6e4 7. c1d2 e4c5
E23 Nimzo-Indian: Spielmann, Staahlberg variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. d1b3 c7c5 5. d4c5 b8c6
6. g1f3 f6e4 7. c1d2 e4c5 8. b3c2 f7f5 9. g2g3
E24 Nimzo-Indian: Saemisch variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. a2a3 b4c3 5. b2c3
E24 Nimzo-Indian: Saemisch, Botvinnik variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. a2a3 b4c3 5. b2c3 c7c5
6. f2f3 d7d5 7. e2e3 0-0 8. c4d5 f6d5
E25 Nimzo-Indian: Saemisch variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. a2a3 b4c3 5. b2c3 c7c5
6. f2f3 d7d5 7. c4d5
E25 Nimzo-Indian: Saemisch, Keres variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. a2a3 b4c3 5. b2c3 c7c5
6. f2f3 d7d5 7. c4d5 f6d5 8. d4c5
E25 Nimzo-Indian: Saemisch, Romanovsky variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. a2a3 b4c3 5. b2c3 c7c5
6. f2f3 d7d5 7. c4d5 f6d5 8. d4c5 f7f5
E26 Nimzo-Indian: Saemisch variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. a2a3 b4c3 5. b2c3 c7c5
6. e2e3
E26 Nimzo-Indian: Saemisch, O'Kelly variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. a2a3 b4c3 5. b2c3 c7c5
6. e2e3 b7b6
E27 Nimzo-Indian: Saemisch variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. a2a3 b4c3 5. b2c3 0-0
E28 Nimzo-Indian: Saemisch variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. a2a3 b4c3 5. b2c3 0-0
6. e2e3
E29 Nimzo-Indian: Saemisch, main line
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. a2a3 b4c3 5. b2c3 0-0
6. e2e3 c7c5 7. f1d3 b8c6
E29 Nimzo-Indian: Saemisch, Capablanca variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. a2a3 b4c3 5. b2c3 0-0
6. e2e3 c7c5 7. f1d3 b8c6 8. g1e2 b7b6 9. e3e4 f6e8
E30 Nimzo-Indian: Leningrad variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. c1g5
E30 Nimzo-Indian: Leningrad, ...b5 gambit
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. c1g5 h7h6 5. g5h4 c7c5
6. d4d5 b7b5
E31 Nimzo-Indian: Leningrad, main line
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. c1g5 h7h6 5. g5h4 c7c5
6. d4d5 d7d6
E32 Nimzo-Indian: classical variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. d1c2
E32 Nimzo-Indian: classical, Adorjan gambit
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. d1c2 0-0 5. a2a3 b4c3
6. c2c3 b7b5
E33 Nimzo-Indian: classical, 4...Nc6
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. d1c2 b8c6
E33 Nimzo-Indian: classical, Milner-Barry (Zurich) variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. d1c2 b8c6 5. g1f3 d7d6
E34 Nimzo-Indian: classical, Noa variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. d1c2 d7d5
E35 Nimzo-Indian: classical, Noa variation, 5.cd ed
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. d1c2 d7d5 5. c4d5 e6d5
E36 Nimzo-Indian: classical, Noa variation, 5.a3
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. d1c2 d7d5 5. a2a3
E36 Nimzo-Indian: classical, Botvinnik variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. d1c2 d7d5 5. a2a3 b4c3
6. c2c3 b8c6
E36 Nimzo-Indian: classical, Noa variation, main line
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. d1c2 d7d5 5. a2a3 b4c3
6. c2c3 f6e4
E37 Nimzo-Indian: classical, Noa variation, main line, 7.Qc2
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. d1c2 d7d5 5. a2a3 b4c3
6. c2c3 f6e4 7. c3c2
E37 Nimzo-Indian: classical, San Remo variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. d1c2 d7d5 5. a2a3 b4c3
6. c2c3 f6e4 7. c3c2 b8c6 8. e2e3 e6e5
E38 Nimzo-Indian: classical, 4...c5
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. d1c2 c7c5
E39 Nimzo-Indian: classical, Pirc variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. d1c2 c7c5 5. d4c5 0-0
E40 Nimzo-Indian: 4.e3
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3
E40 Nimzo-Indian: 4.e3, Taimanov variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 b8c6
E41 Nimzo-Indian: 4.e3 c5
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 c7c5
E41 Nimzo-Indian: e3, Huebner variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 c7c5 5. f1d3 b8c6
6. g1f3 b4c3 7. b2c3 d7d6
E42 Nimzo-Indian: 4.e3 c5, 5.Ne2 (Rubinstein)
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 c7c5 5. g1e2
E43 Nimzo-Indian: Fischer variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 b7b6
E44 Nimzo-Indian: Fischer variation, 5.Ne2
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 b7b6 5. g1e2
E45 Nimzo-Indian: 4.e3, Bronstein (Byrne) variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 b7b6 5. g1e2 c8a6
E46 Nimzo-Indian: 4.e3 O-O
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 0-0
E46 Nimzo-Indian: Reshevsky variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 0-0 5. g1e2
E46 Nimzo-Indian: Simagin variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 0-0 5. g1e2 d7d5
6. a2a3 b4d6
E47 Nimzo-Indian: 4.e3 O-O, 5.Bd3
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 0-0 5. f1d3
E48 Nimzo-Indian: 4.e3 O-O, 5.Bd3 d5
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 0-0 5. f1d3 d7d5
E49 Nimzo-Indian: 4.e3, Botvinnik system
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 0-0 5. f1d3 d7d5
6. a2a3 b4c3 7. b2c3
E50 Nimzo-Indian: 4.e3 e8g8, 5.Nf3, without ...d5
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 0-0 5. g1f3
E51 Nimzo-Indian: 4.e3 e8g8, 5.Nf3 d7d5
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 0-0 5. g1f3 d7d5
E51 Nimzo-Indian: 4.e3, Ragozin variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 0-0 5. g1f3 d7d5
6. f1d3 b8c6 7. 0-0 d5c4
E52 Nimzo-Indian: 4.e3, main line with ...b6
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 0-0 5. g1f3 d7d5
6. f1d3 b7b6
E53 Nimzo-Indian: 4.e3, main line with ...c5
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 0-0 5. g1f3 d7d5
6. f1d3 c7c5
E53 Nimzo-Indian: 4.e3, Keres variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 0-0 5. g1f3 d7d5
6. f1d3 c7c5 7. 0-0 b7b6
E53 Nimzo-Indian: 4.e3, Gligoric system with 7...Nbd7
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 0-0 5. g1f3 d7d5
6. f1d3 c7c5 7. 0-0 b8d7
E54 Nimzo-Indian: 4.e3, Gligoric system with 7...dc
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 0-0 5. g1f3 d7d5
6. f1d3 c7c5 7. 0-0 d5c4 8. d3c4
E54 Nimzo-Indian: 4.e3, Gligoric system, Smyslov variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 0-0 5. g1f3 d7d5
6. f1d3 c7c5 7. 0-0 d5c4 8. d3c4 d8e7
E55 Nimzo-Indian: 4.e3, Gligoric system, Bronstein variation
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 0-0 5. g1f3 d7d5
6. f1d3 c7c5 7. 0-0 d5c4 8. d3c4 b8d7
E56 Nimzo-Indian: 4.e3, main line with 7...Nc6
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 0-0 5. g1f3 d7d5
6. f1d3 c7c5 7. 0-0 b8c6
E57 Nimzo-Indian: 4.e3, main line with 8...dc and 9...cd
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 0-0 5. g1f3 d7d5
6. f1d3 c7c5 7. 0-0 b8c6 8. a2a3 d5c4 9. d3c4 c5d4
E58 Nimzo-Indian: 4.e3, main line with 8...Bxc3
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 0-0 5. g1f3 d7d5
6. f1d3 c7c5 7. 0-0 b8c6 8. a2a3 b4c3 9. b2c3
E59 Nimzo-Indian: 4.e3, main line
1. d2d4 g8f6 2. c2c4 e7e6 3. b1c3 f8b4 4. e2e3 0-0 5. g1f3 d7d5
6. f1d3 c7c5 7. 0-0 b8c6 8. a2a3 b4c3 9. b2c3 d5c4 10. d3c4




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