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
45 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 C60Article3.Bb5Tabiya: 9.h3235 lines
Ruy Lopez
- Open games
- Positional play
- Classical
Pressure that is in no hurry
Study opening - ECO C30Article2.f4Tabiya: 5.Ne5191 lines
King's Gambit
- Open games
- Gambits
- Sharp play
- Open centre
A pawn for speed
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 C503.Bc4Tabiya: 7.Bb3187 lines
Italian Game
- Open games
- Open centre
- Classical
A quiet game with a hidden threat
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 C41Article2…d6Tabiya: 7…c644 lines
Philidor Defense
- Open games
- Solid
A fortress around e5
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 C422…Nf6Tabiya: 7…Nc650 lines
Petrov's Defense
- Open games
- Solid
- Symmetry
A counterpunch instead of a defence
Study opening - ECO C443.d4Tabiya: 8…Nb653 lines
Scotch Game
- Open games
- Big pawn centre
- Open centre
- Classical
The centre opens on move three
Study opening - ECO C252.Nc3Tabiya: 5…Be741 lines
Vienna Game
- Open games
- Classical
Knight on c3, f-pawn at the ready
Study opening - ECO C473…Nf6Tabiya: 8…Qe749 lines
Four Knights Game
- Open games
- Solid
- Classical
- Symmetry
Four knights, no hurry
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 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…g5Tabiya: 4…Qb65 lines
Borg Defense
- Semi-closed games
- Offbeat
Grob, back to front
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.e4Tabiya: 5…Be738 lines
King's Pawn Game
- Open games
- Classical
The first move that opens most of the book
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 - ECO C202.Ke2Tabiya: 3…d51 lines
Bongcloud Attack
- Open games
- Offbeat
The king goes for a walk on move two
Study opening - ECO C203.Qxd4Tabiya: 7…Re819 lines
Center Game
- Open games
- Open centre
- Classical
The queen comes out early, and the fight begins
Study opening - ECO C202.b3Tabiya: 4…Nf63 lines
King's Pawn Opening
- Open games
- Offbeat
A long-diagonal bishop that finds e5 well guarded
Study opening - ECO C202.Bb5Tabiya: 4.Nc33 lines
Portuguese Opening
- Open games
- Offbeat
A Ruy Lopez with the knight left at home
Study opening - ECO C213.c3Tabiya: 5…d58 lines
Danish Gambit
- Open games
- Gambits
- Sharp play
- Open centre
Two pawns for two bishops on open diagonals
Study opening - ECO C232.Bc4Tabiya: 5.Bb341 lines
Bishop's Opening
- Open games
- Open centre
- Classical
The bishop eyes f7 and the f-pawn stays free
Study opening - ECO C2515 lines
Vienna Gambit
- Open games
- Gambits
- Sharp play
Study opening - ECO C402…d5Tabiya: 4…Nf64 lines
Elephant Gambit
- Open games
- Gambits
- Sharp play
- Open centre
A big bite with nothing behind it
Study opening - ECO C402…Qe7Tabiya: 4…d61 lines
Gunderam Defense
- Open games
- Offbeat
The queen guards the pawn and blocks the bishop
Study opening - ECO C402.Nf3Tabiya: 5…Be73 lines
King's Knight Opening
- Open games
- Classical
The most natural second move
Study opening - ECO C402…f5Tabiya: 6…Qg626 lines
Latvian Gambit
- Open games
- Gambits
- Sharp play
A King's Gambit in reverse, and a move late
Study opening - ECO C441 lines
Dresden Opening
- Open games
- Offbeat
Study opening - ECO C443.Nxe5Tabiya: 4…Ng61 lines
Irish Gambit
- Open games
- Gambits
- Sharp play
- Open centre
A knight for a pawn and a hope for the centre
Study opening - ECO C443.c3Tabiya: 6…Qxd516 lines
Ponziani Opening
- Open games
- Classical
A pawn on c3 for the sake of d4
Study opening - ECO C463.Nc3Tabiya: 6…Nf66 lines
Three Knights Opening
- Open games
- Classical
- Symmetry
The fourth knight stays at home
Study opening