(thing) by Protector of Mankind Thu Jan 18 2001 at 5:42:19
ECO chess codes for C4 - Double King Pawn followed by 2. Nf3 
C40      
1. e4 e5   
2. Nf3

C41 - Philidor Defence
1. e4 e5   
2. Nf3 d6

C42 - Petroff Defense
1. e4 e5   
2. Nf3 Nf6

C43 - Petroff Defense/Steinitz Variation
1. e4 e5   
2. Nf3 Nf6   
3. d4

C44      
1. e4 e5   
2. Nf3 Nc6

C45 - Scotch Game
1. e4 e5   
2. Nf3 Nc6   
3. d4 ed4   
4. Nd4

C46 - Three Knights Game
1. e4 e5   
2. Nf3 Nc6   
3. Nc3

C47 - Scotch Four Knights Game
1. e4 e5   
2. Nf3 Nc6   
3. Nc3 Nf6   
4. d4

C48 - Four Knights Game
1. e4 e5   
2. Nf3 Nc6   
3. Nc3 Nf6   
4. Bb5

C49
1. e4 e5   
2. Nf3 Nc6   
3. Nc3 Nf6   
4. Bb5 Bb4

ECO Chess Codes

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