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ECO CLASSIFICATION

Chess Opening Library

Mastering chess openings is about understanding central control, piece harmony, and key move orders. Explore 10 classical chess openings with official ECO codes, initial move sequences, and deep strategic plans.

ECO C60

Ruy Lopez (Spanish Opening)

Move Order
1.e4 e5 2.Nf3 Nc6 3.Bb5

One of the oldest and most respected chess openings focusing on rapid kingside development and immediate indirect pressure on Black's central e5 pawn.

Italian GameFour Knights Game
Study Line →
ECO C50

Italian Game (Giuoco Piano)

Move Order
1.e4 e5 2.Nf3 Nc6 3.Bc4

A classical, fundamental opening developing the bishop to c4, directly targeting Black's vulnerable f7 pawn and establishing harmonious piece play.

Ruy LopezEvans Gambit
Study Line →
ECO B20

Sicilian Defense

Move Order
1.e4 c5

The most popular and highest-scoring response to 1.e4, fighting for central control asymmetrically from the c-file for dynamic winning chances.

French DefenseCaro-Kann Defense
Study Line →
ECO C00

French Defense

Move Order
1.e4 e6 2.d4 d5

A resilient, counter-attacking defense preparing ...d5 to contest White's center with a solid pawn chain and thematic queenside pressure.

Sicilian DefenseCaro-Kann Defense
Study Line →
ECO B10

Caro-Kann Defense

Move Order
1.e4 c6 2.d4 d5

An exceptionally solid response to 1.e4, preparing ...d5 while keeping the light-squared bishop free to develop outside the pawn chain.

French DefenseSicilian Defense
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ECO D06

Queen's Gambit

Move Order
1.d4 d5 2.c4

A fundamental, dominant 1.d4 opening offering the temporary sacrifice of the c4 pawn to seize complete central control.

Slav DefenseKing's Indian Defense
Study Line →
ECO E60

King's Indian Defense

Move Order
1.d4 Nf6 2.c4 g6 3.Nc3 Bg7

A dynamic, hypermodern defense where Black concedes central space early, fianchettoes the dark-squared bishop, and launches a ferocious kingside attack.

Queen's GambitGrünfeld Defense
Study Line →
ECO A45

London System

Move Order
1.d4 d5 2.Nf3 Nf6 3.Bf4

A universally solid, low-theory opening setup for White that builds an impenetrable pyramid center and places the dark-squared bishop actively outside the pawn chain.

Queen's GambitColle System
Study Line →
ECO B07

Pirc Defense

Move Order
1.e4 d6 2.d4 Nf6 3.Nc3 g6

A flexible, counterattacking defense against 1.e4 where Black builds a compact kingside fortress and strikes at White's expanded pawn center.

King's Indian DefenseModern Defense
Study Line →
ECO B01

Scandinavian Defense

Move Order
1.e4 d5

An immediate, combative strike against White's e4 pawn on move 1, forcing early piece mobilization and clear, open central files.

French DefenseCaro-Kann Defense
Study Line →

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