ECO chess codes A2 - King's English (Reversed Sicilian
A20 - King's English (Reversed Sicilian) 
1. c4 e5

A21 
1. c4 e5   
2. Nc3

A22 
1. c4 e5   
2. Nc3 Nf6

A23 
1. c4 e5   
2. Nc3 Nf6   
3. g3 c6

A24 
1. c4 e5   
2. Nc3 Nf6   
3. g3 g6

A25  
1. c4 e5   
2. Nc3 Nc6

A26 
1. c4 e5   
2. Nc3 Nc6   
3. g3 g6   
4. Bg2 Bg7   
5. d3 d6

A27 
1. c4 e5   
2. Nc3 Nc6   
3. Nf3

A28 - The English/Four Knights variation 
1. c4 e5   
2. Nc3 Nc6   
3. Nf3 Nf6

A29 
1. c4 e5   
2. Nc3 Nc6   
3. Nf3 Nf6 
4. g3

ECO chess codes
Chess Notation
Chess Openings

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