For the improving chess player
Every move you have ever played, rated by a full-strength engine. An AI coach reads those numbers and hands you one thing to fix — why it keeps costing you, and drills built from your own positions.
Your coach: Bxh7+ hangs the bishop — the same “greek gift” you’ve now missed the refutation for in 3 games. Let’s drill it.
Link your chess.com username
No password. Your games come from chess.com’s public API.
The engine rates every move
The best move, exactly what yours cost, and where the game turned.
Your coach turns it into a plan
Patterns across hundreds of games, ranked, with drills from your own positions.
Blunder patterns
Every mistake is classified by what actually went wrong, then cross-referenced with when it happened — which phase of the game, and how much time was left on your clock. What feels like bad luck scattered across 400 games is usually three or four habits.
Most of your blunders arrive with under 30 seconds left — the same tactics you handle comfortably when you have time to think.
31 of your 58 blunders are a hung piece, and four in five land after move 20 with under a minute left.
baseline 6.1 · 42% there
Drills
Next up Converting winning endgames
From 400 games to one thing to fix
Plenty of tools hand you an accuracy percentage and leave you to work out what to do about it. ChessMaster ranks what is actually costing you rating, commits to a number worth moving, and re-reads that number from your live games as you play.
Everything in one place
Your record by time class, your rating trend, and every recent game scored for accuracy and mistakes — with analysis running live as you sync.
Two trainers, both built from your own games: replay the position right before a mistake, or list the moves you were weighing and have the engine rank your whole list.
Blunders tagged by type, weakness by phase of the game, accuracy and win-rate in every opening you play, and what the clock is really costing you.
An ordered improvement program with a measurable target per focus area, a written report on your blunders, and a lesson for each opening you play.
Engine + AI, in their lanes
Nothing here is a language model guessing at chess. The engine decides what every move was worth, to the centipawn. The coach never overrules it — it reads the numbers, finds the pattern across hundreds of games, and puts it in words you can act on.
The best move in every position, and exactly what yours cost. It runs in your own browser, so your games are analysed without waiting in anyone’s queue.
It reads those numbers across your whole history, then writes the program, the blunder report and the opening lessons around what it finds.
Link your chess.com account and the first games start analysing within minutes — no upload, no PGN wrangling, nothing to install.