Full game history ingest
Connect Chess.com or Lichess usernames and PrepDeck pulls every available game — hundreds or thousands — and mines the aggregate for patterns no human scout could catch.
What PrepDeck builds for you
Exploitable weakness map
Statistical engine surfaces where the opponent bleeds: opening deviations they fumble, endgame structures they mishandle, piece coordination they repeatedly botch. Ranked by severity and frequency.
Time-pressure tendencies
Blunders cluster in positions reached after move 25 under time pressure. PrepDeck tracks clock management patterns so you know exactly when to complicate.
Anti-repertoire lines
PrepDeck maps the opponent's opening loyalty — their pet lines, transpositions they avoid, and the sidelines that take them out of book fastest. You choose what to play; the engine explains why.
Psychological dossier
Tilt patterns after losses, performance against stronger vs weaker players, opening loyalty under rating pressure — the kind of read your seconds build over weeks, in minutes.
Socratic training sessions
The coach asks for your move before revealing the answer. Warm, patient grandmaster voice. No lecture mode — pure thinking, guided by the right question at the right moment.
Why PrepDeck is different
Human prep, not engine lines
Stockfish tells you what's correct. Maia tells you what a human at that rating actually plays. PrepDeck combines both — so you train for the game you'll actually face, not a perfect response tree.
Upload your own games
Play OTB? Upload PGN files or photograph your scoresheet. PrepDeck's OCR pipeline converts handwritten notation into analyzable game data.
One opponent, full dossier
This isn't a general opening trainer. Every session is opponent-specific — the weaknesses, lines, and drills are built for the person sitting across from you on Saturday.
Preparation is the only unfair advantage.
Start free — your first opponent prep is on us. No credit card, no commitment.