ECO C20
28 named openings and variations are classified as C20. ECO (Encyclopaedia of Chess Openings) codes group openings from A00 to E99 by their opening moves.
- Barnes Opening: WalkerlingC201. f3 e5 2. e4 Nf6 3. Bc4
- Bongcloud AttackC201. e4 e5 2. Ke2
- Center GameC201. e4 e5 2. d4
- English Opening: The WhaleC201. e4 e5 2. c4
- King's Pawn Game: Alapin OpeningC201. e4 e5 2. Ne2
- King's Pawn Game: Bavarian GambitC201. e4 e5 2. c4 d5
- King's Pawn Game: Beyer GambitC201. e4 e5 2. d4 d5
- King's Pawn Game: Clam Variation, King's Gambit ReversedC201. e4 e5 2. d3 f5
- King's Pawn Game: Clam Variation, Radisch GambitC201. e4 e5 2. d3 Nf6 3. f4 Bc5
- King's Pawn Game: King's Head OpeningC201. e4 e5 2. f3
- King's Pawn Game: Leonardis VariationC201. e4 e5 2. d3
- King's Pawn Game: MacLeod AttackC201. e4 e5 2. c3
- King's Pawn Game: MacLeod Attack, Lasa GambitC201. e4 e5 2. c3 f5
- King's Pawn Game: MacLeod Attack, Norwalde GambitC201. e4 e5 2. c3 d5 3. Qh5 Bd6
- King's Pawn Game: Mengarini's OpeningC201. e4 e5 2. a3
- King's Pawn Game: Napoleon AttackC201. e4 e5 2. Qf3
- King's Pawn Game: Philidor GambitC201. e4 e5 2. d4 d6 3. dxe5 Bd7
- King's Pawn Game: Tortoise OpeningC201. e4 e5 2. Bd3
- King's Pawn Game: Wayward Queen AttackC201. e4 e5 2. Qh5
- King's Pawn Game: Wayward Queen Attack, Kiddie CountergambitC201. e4 e5 2. Qh5 Nf6
- King's Pawn Game: Wayward Queen Attack, Mellon GambitC201. e4 e5 2. Qh5 Nc6 3. Bc4 Nh6 4. d3 g6 5. Qf3 f6 6. Ne2 d5
- King's Pawn Game: Weber GambitC201. e4 e5 2. d3 d5 3. exd5 c6 4. dxc6 Nxc6
- King's Pawn OpeningC201. e4 e5 2. b3
- King's Pawn Opening: SpeersC201. e4 e5 2. Qg4 Nf6 3. Qf5
- King's Pawn Opening: Van Hooydoon GambitC201. e4 e5 2. Qe2 Nc6 3. c3 Nf6 4. Nf3 Bc5 5. d4 exd4 6. cxd4 Nxd4
- Portuguese OpeningC201. e4 e5 2. Bb5
- Portuguese Opening: Miguel GambitC201. e4 e5 2. Bb5 Bc5 3. b4
- Portuguese Opening: Portuguese GambitC201. e4 e5 2. Bb5 Nf6 3. d4