BlunderSchool
Trainer

Train Your Repertoire

Learn opening lines move-by-move, then let spaced repetition bring them back right before you'd forget. Four modes: Learn (guided), Practice (pure recall), Review (what's due today), and Drill (beat the clock). Progress saves in your browser — no account needed.

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white • beginner

London System Starter

The set-it-and-forget-it White opening. One structure against almost everything Black plays — solid, safe, and sneakily aggressive.

Mastery0% · 4 lines
London System
white • beginner

Italian Game + Fried Liver

The classic 1.e4 repertoire: develop fast, castle early, and punish careless knights with the most famous attack in chess.

Mastery0% · 4 lines
Italian Game
white • intermediate

Vienna Gambit

1.e4 e5 2.Nc3 then f4! — a King's Gambit with the safety on. One of the highest-scoring openings online.

Mastery0% · 3 lines
Vienna Gambit
white • intermediate

Queen's Gambit Essentials

The classical 1.d4 repertoire — pressure d5 forever. The opening every world champion has played.

Mastery0% · 3 lines
Queen's Gambit
black • beginner

Caro-Kann: The Solid Wall

The pro's answer to 1.e4 — get the good bishop OUT, build the wall, and grind. Almost impossible to attack.

Mastery0% · 4 lines
Caro-Kann Defense
black • beginner

Scandinavian: Qa5 System

Fight for the center on move one. Simple rules, one setup, and opponents who never know the theory.

Mastery0% · 3 lines
Scandinavian Defense
black • intermediate

Stafford Gambit: Trap Everything

The internet's most dangerous gambit. Objectively dubious, practically lethal — know the traps, win in 10 moves.

Mastery0% · 3 lines
Stafford Gambit
black • intermediate

King's Indian: The Pawn Storm

Let White have the center — then throw every kingside pawn at their king. The most fun defense in chess.

Mastery0% · 3 lines
King's Indian Defense