Observed arrival · 2026-09-07
Checkup Chess Finds the Mistakes You Keep Making
A chess-analysis tool that identifies the move that swung each Chess.com game and reports recurring mistakes across a player's games.
Field notes
The page separates analysis into three jobs: Stockfish evaluates positions at fixed depth 15, deterministic code calculates statistics and thresholds, and a language model turns an already-found engine line into prose. It also says every move named in an explanation is checked against the actual position, while the displayed report anonymises players and is generated from a public game. Chess.com import is marked shipped; Lichess import and user accounts are not built.
Observed signals
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Editorial observations of this landing page, not a rating.
One card from the complete issue