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C20 - 1. e4 e5 - King's Pawn Game (5)
King's Pawn Game Coups: 1. e4 e5 -
C22 - 1. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qc4 - Center Game: Hall Variation (1)
Center Game: Hall Variation Coups: 1. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qc4 -
C24 - 1. e4 e5 2. Bc4 Nf6 - Bishop's Opening (5)
Code ECO C24 - Bishop's Opening Coups: 1. e4 e5 2. Bc4 Nf6 -
C26 - 1. e4 e5 2. Bc4 Nf6 3. Nc3 b5 - Bishop's Opening (3)
Code ECO C26 - Bishop's Opening Coups: 1. e4 e5 2. Bc4 Nf6 3. Nc3 b5 -
C28 - 1. e4 e5 2. Nc3 Nc6 3. Bc4 Nf6 - Vienna Game: Stanley Variation, Three Knights Variation (1)
Vienna Game: Stanley Variation, Three Knights Variation Coups: 1. e4 e5 2. Nc3 Nc6 3. Bc4 Nf6