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

Famous Traps — White

The greatest hits: Légal's Mate, the Greco, the ICBM... every legendary White trap that wins a queen or delivers mate, drilled move-by-move.

Mastery0% · 7 lines
black • beginner

Famous Traps — Black

The legends: the Lasker knight-promotion, the Elephant, the Fishing Pole, Qh2# in Siberia... every famous Black trap that wins a queen or mates, drilled until automatic.

Mastery0% · 10 lines
black • advanced

Sicilian Najdorf

The most respected weapon in chess. ...a6 controls b5, then flexible, fighting play. Fischer's and Kasparov's favorite.

Mastery0% · 16 lines
Najdorf Sicilian
black • intermediate

Accelerated Dragon

Fianchetto fast, skip the Yugoslav Attack, and breathe fire down the long diagonal. A sharp, fun Sicilian for Black.

Mastery0% · 25 lines
Accelerated Dragon
black • intermediate

French Defense

Build the pawn chain, free the bad bishop, and counterattack the base. Solid, strategic, and hard to break.

Mastery0% · 22 lines
French Defense
white • intermediate

Ruy Lopez

The Spanish Torture. Pin the knight, build the center, and squeeze for the whole game. The most classical opening in chess.

Mastery0% · 16 lines
Ruy Lopez
black • intermediate

Queen's Gambit Declined

Hold the center with ...e6 and defend like a world champion. The most solid answer to 1.d4 ever devised.

Mastery0% · 27 lines
Queen's Gambit Declined
white • intermediate

Evans Gambit

Sacrifice the b-pawn for a monster center and a raging attack. Romantic-era violence that still crushes club players.

Mastery0% · 21 lines
Evans Gambit
white • intermediate

Fried Liver Attack

The most famous sacrifice in chess. Drag the king into the open with Nxf7 and hunt it down. Every variation, drilled.

Mastery0% · 21 lines
Fried Liver Attack
white • intermediate

Alien Gambit

The internet's wildest anti-Caro weapon. The knight leaps to e6 and cannot be captured. Pure abduction chess.

Mastery0% · 8 lines
Alien Gambit
white • intermediate

Leonhardt Gambit (Lionheart)

Sacrifice the b-pawn against the Scandinavian to chase the queen and blast open the position. Aggressive, tricky, and a total blast to play.

Mastery0% · 18 lines
Scandinavian Defense
white • intermediate

Queen's Gambit Essentials

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

Mastery0% · 30 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% · 31 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% · 29 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% · 8 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% · 12 lines
King's Indian Defense
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% · 26 lines
Vienna Gambit
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% · 25 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% · 31 lines
Italian Game