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Moves
Visualization shows a real game diagram: choose a 2, 4, 6, or 8-ply lead-in, play it in your head, find the mate in 3 without moving the board, then rebuild the final position on an empty board.Rated puzzles serves puzzles near the level you pick. Missed ones return on expanding intervals.My mistakes replays the exact positions you got wrong in graded games until you'd never miss them again. Any move within a whisker of the engine's best counts.
Technique
The engine defends accurately, so only correct technique works. In a mating drill, a stalemate, a repetition or the fifty-move rule is a miss. In a drawing drill, any draw counts. Completions show in Stats.
Concepts
Learn the ideas that win games. Each one has a lesson on the board and a position to practice.
Concepts
Your progress
Repertoire drills
0/0 linesDrill your repertoire until it sticks. Plans, ideas, and the London, Jobava London, Colle, Pirc and Philidor courses are in .
Why this move
Pick a chapter. You play the repertoire side one move at a time. The gold arrow shows the next move when hints are on.
Browse full variations
Master
Your progress
Your game library
Every game is graded once. Tap a game to review it. Expand a card for its scorecard.
Import a game
New games are graded automatically and then appear in your library.
Paste a PGN
Chess.com or Lichess
Game details and tools
Game review
Step through with the arrows or the ← → keys. Every move gets graded against the engine, with the reasoning spelled out. Move a piece to explore a different line; press Esc or Exit analysis to return.
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Progress
Your data
Your progress is saved in this browser.