Opening study, refined
Opening preparation for every game you play.
Train 100+ official courses of established systems, as White or as Black. Learn the idea, then play the line without assistance.
Game Review
Your games, reviewed move by move.
Paste any PGN and get a full report in seconds — opening accuracy against the official courses, engine grades on every decision, and coach notes that say exactly where the line slipped.
Review a game
Your repertoire
Bring over your whole repertoire.
Paste a PGN and it becomes a course you can learn, drill, and practise as White or Black.
Open your repertoire
Blunder Override
Find the games you threw away.
Every game where you dropped a winning position. Replay the exact move, see what the engine expected, and train the position you actually faced.
Review your blundersPuzzles
Tactics, drawn from your level.
Solve puzzles to appear on the live Leaderboard.
Solve a puzzleCommunity Courses
Courses other players wrote.
Opening courses published by members. Your first is free; publish your own and it lands in the same list everyone else learns from.
See community coursesPractice leaderboard
Daily, weekly, and all-time boards.
Practice mode earns points. Climb today, this week, or the all-time list.
Open leaderboardAppearance
Board, pieces, arrows, and highlights.
Pick the board and piece set you like, then tune arrows and square highlights in Settings.
Sign in to customize
Community
Join the Discord.
Ask about lines, share a repertoire, report a bug, and see what we ship next. The server is the fastest way to reach us.
- Opening questions and line feedback
- Repertoire and endgame discussion
- Release notes and early peeks
