1,506+ free guides · A00 → E99

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From the Ruy Lopez to the Grünfeld — clear move orders, strategic ideas, traps and model lines for every opening and defence in the ECO encyclopedia. Free forever.

The Opera Game — Morphy, 1858

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ECO codes A00–E99

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Featured guides

The openings that decide more games than any others — each with a full interactive walkthrough.

Sicilian Defence, Najdorf Variation

B90

The Najdorf is chess at its most ferocious. Black's humble 5...a6 does three jobs at once — it stops Bb5, prepares ...b5 expansion and lets the queen roam — and in return White gets a free hand in the centre. What follows is a knife fight where both players know that one slip decides everything. Fischer and Kasparov both trusted it at the very top, which tells you everything about its fighting credentials.

For BlackExpert

Ruy Lopez

C60

The Ruy Lopez is chess's cathedral — every world champion has prayed here. White's bishop pins the c6-knight against the e5 pawn, building the slow, inexorable squeeze that made Capablanca, Fischer and Karpov immortal. Black has a dozen rich defensive systems, from Kramnik's Berlin Wall to Kasparov's Marshall Attack.

For WhiteAdvanced

King's Indian Defence

E60

The King's Indian is chess's great romance: Black invites White to build the biggest centre in the opening, then burns it down with ...e5, ...f5 and a full-scale pawn storm. Fischer's devastations, Kasparov's Mar del Plata brilliancies and Radjabov's modern revivals all flow from the same fearless idea.

For BlackIntermediate

Italian Game

C50

The Italian Game is where most players fall in love with chess — and where the modern elite now spend their theory budgets. The Giuoco Pianissimo squeezes are the new main lines: slow, rich, and full of long-term plans that reward deep understanding.

For WhiteBeginner-friendly

Queen's Gambit Declined

D30

The Queen's Gambit Declined is the most respected defence in chess history — every world champion has defended it and attacked it. Black accepts slight cramping for a rock-solid structure, and the middlegames test deep understanding: minority attacks versus c5 breaks, light-square wars and endgame technique.

For BlackIntermediate

Grünfeld Defence

D80

The Grünfeld is hypermodern dynamism in its purest form: Black hands White the entire centre, then attacks it from the flanks with the mighty g7-bishop and relentless piece pressure. It is the opening of Fischer's Game of the Century and of every engine-era warrior.

For BlackAdvanced

Nimzo-Indian Defence

E20

Aron Nimzowitsch's 1910s masterpiece remains the most respected way to meet 1.d4: the ...Bb4 pin fights for e4, pressures c3 and offers structural concessions for the bishop pair. A century of world champions — from Capablanca and Botvinnik to Carlsen and Caruana — made it their main weapon.

For BlackIntermediate

French Defence

C00

The French Defence is the opening of strategic counterpunchers: Black invites White to build a big centre, then spends the whole game hammering at it. The bad bishop on c8 is a small price for the healthiest structure in chess — Botvinnik, Korchnoi and Morozevich all made it their life's work.

For BlackIntermediate

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