├── C20 - 1. e4 e5 - King's Pawn Game (9)
├── C21 - 1. e4 e5 2. d4 exd4 - Center Game Accepted (0)
├── C22 - 1. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qc4 - Center Game: Hall Variation (1)
├── C23 - 1. e4 e5 2. Bc4 - Bishop's Opening (0)
├── C24 - 1. e4 e5 2. Bc4 Nf6 - Bishop's Opening (16)
├── C25 - 1. e4 e5 2. Nc3 - Vienna Game (2)
├── C26 - 1. e4 e5 2. Bc4 Nf6 3. Nc3 (7)
├── C26 - 1. e4 e5 2. Nc3 Nf6 3. Bc4 Bc5 4. d3 - Bishop's Opening: Vienna Hybrid, Spielmann Attack (2)
├── C26 - 1. e4 e5 2. Nc3 Nf6 3. d4 exd4 4. Qxd4 Nc6 - Vienna Game: Falkbeer Variation (3)
├── C27 - 1. e4 e5 2. Nc3 Nf6 3. Bc4 Nxe4 - Vienna Game: Frankenstein-Dracula Variation (1)
├── C28 - 1. e4 e5 2. Nc3 Nc6 3. Bc4 Nf6 - Vienna Game: Stanley Variation, Three Knights Variation (0)
└── C29 - 1. e4 e5 2. Nc3 Nf6 3. f4 - Vienna Game: Vienna Gambit (1)