Openings
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Codex of Opening Systems
All 126 opening families in one catalogue: search by name, move or player, and filter by the kind of position.
Key set-ups
21 families
ECO B20Article1…c5Tabiya: 5.Nc3391 linesSicilian Defense
- Semi-open games
- Sharp play
- Asymmetry
Answer not with a mirror, but with a strike from the side
Study opening- ECO C001…e6Tabiya: 7.Be3212 lines
French Defense
- Semi-open games
- Solid
- Pawn chain
Chain against chain
Study opening - ECO B104…Bf5Tabiya: 7…Nd7110 lines
Caro-Kann Defense
- Semi-open games
- Solid
The bishop first, the pawn after
Study opening - ECO B00Article3…g6Tabiya: 6.O-O28 lines
Pirc Defense
- Semi-open games
- Fianchetto
- Sharp play
- Big pawn centre
Let them build a centre: we will undermine it from the wings
Study opening - ECO B011…d5Tabiya: 7…e645 lines
Scandinavian Defense
- Semi-open games
- Solid
The queen goes first
Study opening - ECO B021…Nf6Tabiya: 8…Nb656 lines
Alekhine Defense
- Semi-open games
- Sharp play
- Big pawn centre
- Hypermodern
Let the pawns run far from home
Study opening - ECO B061…g6Tabiya: 6…Nd739 lines
Modern Defense
- Semi-open games
- Fianchetto
- Big pawn centre
- Hypermodern
Let them build, then take it apart
Study opening - ECO A4111 lines
Rat Defense
- Semi-open games
- Offbeat
Study opening - ECO B001…f6Tabiya: 3.Nf31 lines
Barnes Defense
- Semi-open games
- Offbeat
The f6 pawn takes the best square from Black's own knight
Study opening - ECO B001…h6Tabiya: 3…Nf62 lines
Carr Defense
- Semi-open games
- Offbeat
A waiting move for Black, with no fight for the centre
Study opening - ECO B001…f5Tabiya: 4…Nc61 lines
Duras Gambit
- Semi-open games
- Gambits
- Offbeat
A pawn thrown at e4, and a bet on chaos
Study opening - ECO B002…Kf7Tabiya: 2…Kf71 lines
Fried Fox Defense
- Semi-open games
- Offbeat
The king steps out first, hoping you are not ready
Study opening - ECO B001…h5Tabiya: 3.Nc32 lines
Goldsmith Defense
- Semi-open games
- Offbeat
A rook pawn two steps forward, and the rook has no idea why
Study opening - ECO B001…Nh6Tabiya: 5…O-O2 lines
Hippopotamus Defense
- Semi-open games
- Set-up systems
- Offbeat
A knight on the rim and a bet on patience
Study opening - ECO B001…Na6Tabiya: 3…e61 lines
Lemming Defense
- Semi-open games
- Offbeat
A knight to the rim and a bet on doubled pawns
Study opening - ECO B001…Nc6Tabiya: 5.Be243 lines
Nimzowitsch Defense
- Semi-open games
- Hypermodern
The knight before the pawns
Study opening - ECO B001…b6Tabiya: 4…c58 lines
Owen Defense
- Semi-open games
- Fianchetto
- Hypermodern
A bishop on b7 and a hope that the opponent is unprepared
Study opening - ECO B001…a6Tabiya: 4…e64 lines
St. George Defense
- Semi-open games
- Offbeat
Give up the centre and strike from the wing
Study opening - ECO B001…a5Tabiya: 3…Bb72 lines
Ware Defense
- Semi-open games
- Offbeat
A rook pawn move in place of a fight for the centre
Study opening - ECO B073…c6Tabiya: 5…e51 lines
Czech Defense
- Semi-open games
- Solid
A Pirc without …g6: c6 first, the rest later
Study opening - ECO B073…Nbd7Tabiya: 6…c66 lines
Lion Defense
- Semi-open games
- Hypermodern
A Philidor that came in through the Pirc door
Study opening