Learn from your own mistakes. Your games are analyzed by Stockfish, then you drill the correct moves with spaced repetition.
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Your games
Fetches from Lichess and chess.com automatically
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Stockfish analysis
Parallel depth-18 analysis finds every mistake
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Find a better move
Drag the correct piece. Context, explanation, best line
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Spaced repetition
Positions come back until mastered (SM-2 algorithm)