Learn the openings you actually face
Every guide walks the main line move by move on an interactive board, covers the variations that appear in real club games, and shows the famous traps — every move list and every trap machine-verified with a chess engine before publication.
No sign-up needed to read them. When you're ready to find out which openings are actually costing you points, Blunders analyzes your own games and turns your mistakes into training.
The free account needs no credit card — Pro is optional.
Openings for White
London System
A45–A48, D00–D02The London System — 1.d4 d5 2.Bf4
Read the guide →Italian Game
C50–C59The Italian Game — 1.e4 e5 2.Nf3 Nc6 3.Bc4
Read the guide →Queen's Gambit
D06–D69The Queen's Gambit — 1.d4 d5 2.c4
Read the guide →Vienna Game
C25–C29The Vienna Game — 1.e4 e5 2.Nc3
Read the guide →Scotch Game
C44–C45The Scotch Game — 1.e4 e5 2.Nf3 Nc6 3.d4
Read the guide →Ruy Lopez
C60–C99The Ruy Lopez — 1.e4 e5 2.Nf3 Nc6 3.Bb5
Read the guide →English Opening
A10–A39The English Opening — 1.c4
Read the guide →Defenses for Black
Caro-Kann Defense
B10–B19The Caro-Kann Defense — 1.e4 c6 2.d4 d5
Read the guide →Sicilian Defense
B20–B99The Sicilian Defense — 1.e4 c5
Read the guide →French Defense
C00–C19The French Defense — 1.e4 e6 2.d4 d5
Read the guide →Scandinavian Defense
B01The Scandinavian Defense — 1.e4 d5
Read the guide →King's Indian Defense
E60–E99The King's Indian Defense — 1.d4 Nf6 2.c4 g6
Read the guide →Slav Defense
D10–D19The Slav Defense — 1.d4 d5 2.c4 c6
Read the guide →Pirc Defense
B07–B09The Pirc Defense — 1.e4 d6 2.d4 Nf6 3.Nc3 g6
Read the guide →Dutch Defense
A80–A99The Dutch Defense — 1.d4 f5
Read the guide →Openings are where games start. Blunders is where they're lost.
Blunders analyzes the games you actually play, finds the moves that cost you, and turns them into puzzles you drill until the pattern sticks. Free puzzles, opening training, and bot play. The free account needs no credit card — Pro is optional.