Chess Openings

Guides to 69 chess openings, grouped the way players think about them: the main line, key ideas, typical plans and who should play each one — every guide paired with an interactive GM-authored course you can train against a human-like AI opponent.

Sicilian Defense (1.e4 c5)

The most played answer to 1.e4 and the richest battleground in chess. Black gives up symmetry from move one to fight for the initiative on the queenside, which is why the Sicilian produces more decisive games than any other opening. Our courses cover both sides: full repertoires for Black in the main systems, and concrete anti-Sicilian weapons for White.

Open Games (1.e4 e5)

The classical way to meet 1.e4: Black stakes an equal claim in the center and the pieces come out fast. This is where the Ruy Lopez, the Italian Game and the romantic gambits live — the ideal family for learning attack, defense and piece activity, because the tactics show up in the first ten moves.

French Defense (1.e4 e6)

A defense built on structure: Black locks the center with ...d5 and plays for the ...c5 break, accepting a passive light-squared bishop in exchange for a rock-solid pawn chain. It rewards players who enjoy long-term plans and know how to handle closed positions.

Caro-Kann Defense (1.e4 c6)

The French Defense's healthier cousin: Black fights for the center with ...d5 but develops the light-squared bishop outside the pawn chain first. Sound structure, safe king, and endgames that keep favoring Black — the practical choice when you cannot afford to lose.

Other Defenses to 1.e4

Hypermodern and offbeat answers to 1.e4: invite White to build a big center, then attack it. The Pirc, Modern, Alekhine and Scandinavian keep theory light and drag opponents out of their preparation early — ideal if you would rather understand a system than memorize twenty moves.

Queen's Gambit and 1.d4 d5

The classical queen's-pawn battleground: Black meets 1.d4 with ...d5 and both sides fight over the c4/d5 squares. Slow, strategic and deeply mapped — this family teaches pawn structures, the minority attack, and the technique that decides most club games.

Indian Defenses (1.d4 Nf6)

Black answers 1.d4 with ...Nf6 and stays flexible, choosing the pawn structure a move later. The King's Indian, Nimzo-Indian, Grünfeld and Benoni all start here, ranging from razor-sharp kingside attacks to precise positional control — the family with the most variety in the repertoire.

Other 1.d4 Openings

Queen's-pawn systems that leave the main highways early. Fewer forced lines, more understanding: you get familiar structures against almost anything, which is why these systems are so popular with players who value their study time.

Flank Openings (1.c4, 1.Nf3, 1.b3)

Control the center from the wings before committing a pawn to it. The English, Réti and Nimzo-Larsen transpose into countless structures, so they suit players who like to steer the game and avoid their opponent's home preparation.

How to choose your opening repertoire

Pick openings that produce the positions you enjoy playing, not the ones with the best reputation. Attacking players get more out of the Open Games and the sharp Sicilians; positional players do better with the Caro-Kann, the French or a Queen's Gambit setup. Build one answer to 1.e4 and one to 1.d4 first, learn the plans behind the moves rather than long forcing lines, and only add a second repertoire once the first one feels automatic.

Every guide here explains the ideas before the theory, and the matching course lets you practice the critical positions with instant feedback. New to the terminology? Start with the chess terms glossary.

Looking for a line these courses don't cover? The ECO opening encyclopedia catalogues every named variation from A00 to E99.