Observed arrival · 2026-09-30
TheoryChess puts chess openings on the board
A chess-learning site for practicing opening lines against a machine, with Stockfish explanations and spaced repetition.
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$Paid
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✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Chess learners studying opening theory
- Worth noticing
- The homepage says it covers 80 openings and brings back error-prone lines more often.
Field notes
The homepage lays out a choose-play-repeat workflow and names six example openings, from the Caro-Kann to the French Defense. It says learners can undo departures from a chosen line and receive move explanations, with difficult lines scheduled more often. The page credits Stockfish.js and identifies licenses for the opening data and piece sets; these are homepage descriptions, not independently tested capabilities.
Observed signals
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Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
◎NicheUnusually specific use
ƒJavaScriptBrowser-side code central
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