ECO Chess Codes E0 - Catalan
E00 - Neo-Catalan
1. d4 Nf6   
2. c4 e6   
3. g3

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

E02 - Catalan/Open Variation
1. d4 Nf6   
2. c4 e6   
3. g3 d5   
4. Bg2 dc4   
5. Qa4

E03
1. d4 Nf6   
2. c4 e6   
3. g3 d5   
4. Bg2 dc4   
5. Qa4 Nbd7
6. Qc4

E04
1. d4 Nf6   
2. c4 e6   
3. g3 d5   
4. Bg2 dc4   
5. Nf3

E05
1. d4 Nf6   
2. c4 e6   
3. g3 d5   
4. Bg2 dc4   
5. Nf3 Be7

E06 - Catalan/Closed Variation
1. d4 Nf6   
2. c4 e6   
3. g3 d5   
4. Bg2 Be7   
5. Nf3

E07
1. d4 Nf6   
2. c4 e6   
3. g3 d5   
4. Bg2 Be7   
5. Nf3 O-O
6. O-O Nbd7

E08
1. d4 Nf6   
2. c4 e6   
3. g3 d5   
4. Bg2 Be7   
5. Nf3 O-O  
6. O-O Nbd7   
7. Qc2

E09
1. d4 Nf6   
2. c4 e6   
3. g3 d5   
4. Bg2 Be7   
5. Nf3 O-O
6. O-O Nbd7   
7. Qc2 c6   
8. Nbd2
ECO Chess Codes
Chess Notation
Chess Openings

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