ECO C2 Double King Pawns
C20 - Double King Pawn Opening
1. e4 e5
C21 - Centre Game/Danish Gambit
1. e4 e5
2. d4 ed4
C22 - Centre Game
1. e4 e5
2. d4 ed4
3. Qd4 Nc6
C23 - Bishop's Opening
1. e4 e5
2. Bc4
C24
1. e4 e5
2. Bc4 Nf6
C25 - Vienna Game
1. e4 e5
2. Nc3
C26
1. e4 e5
2. Nc3 Nf6
C27 - Vienna Game, Frankenstein-Dracula Variation
1. e4 e5
2. Nc3 Nf6
3. Bc4 Ne4
C28 - Vienna Game
1. e4 e5
2. Nc3 Nf6
3. Bc4 Nc6
C29 - Vienna Gambit
1. e4 e5
2. Nc3 Nf6
3. f4 d5
ECO chess codes