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ECO A11: Réti Opening & English Opening

ECO A11 is part of volume A — Flank Openings. The Lichess chess-openings dataset files 12 named lines under it, from 2 different openings. The shortest is English Opening: Caro-Kann Defensive System: 1. c4 c6.

That position has come up in 6,525,530 Lichess games between players rated 1600 to 2500: White won 48.1%, 6.0% were drawn and Black won 45.9%.

OpeningMovesPlies
English Opening: Caro-Kann Defensive System 1. c4 c6 2
Réti Opening: Anglo-Slav Variation, Gurevich System 1. c4 c6 2. Nf3 d5 3. e3 5
Réti Opening: Anglo-Slav Variation, Gurevich System 1. c4 c6 2. Nf3 d5 3. e3 Nf6 4. Qc2 7
Réti Opening: Anglo-Slav Variation, with g3 1. c4 c6 2. Nf3 d5 3. g3 Nf6 4. Bg2 7
Réti Opening: Anglo-Slav Variation, with g3 1. c4 c6 2. Nf3 d5 3. g3 Nf6 4. b3 g6 8
Réti Opening: Anglo-Slav Variation, with g3 1. c4 c6 2. Nf3 d5 3. g3 Nf6 4. Bg2 dxc4 8
Réti Opening: Anglo-Slav Variation, with g3 1. c4 c6 2. Nf3 d5 3. g3 Nf6 4. Bg2 Bf5 8
Réti Opening: Anglo-Slav Variation, Gurevich System 1. c4 c6 2. Nf3 d5 3. e3 Nf6 4. Nc3 Nbd7 5. Qc2 9
Réti Opening: Anglo-Slav Variation, Gurevich System 1. c4 c6 2. Nf3 d5 3. e3 Nf6 4. Nc3 Nbd7 5. b3 e5 10
Réti Opening: Anglo-Slav Variation, Gurevich System 1. c4 c6 2. Nf3 d5 3. e3 Nf6 4. Nc3 e6 5. b3 Bd6 10
Réti Opening: Anglo-Slav Variation, with g3 1. c4 c6 2. Nf3 d5 3. g3 Nf6 4. Bg2 Bf5 5. O-O e6 6. d3 11
Réti Opening: Anglo-Slav Variation, with g3 1. Nf3 Nf6 2. g3 d5 3. Bg2 c6 4. O-O Bf5 5. d3 h6 6. c4 e6 12

https://chesscodex.org/eco/A11