Observed arrival · 2026-10-10
What’s This Position: a chess engine that explains its work
A free, open-source browser tool for reviewing Chess.com, Lichess, or PGN games and analyzing individual chess positions.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Chess players reviewing games or positions
- Worth noticing
- Move labels use winning-chance thresholds; “Brilliant” also checks exchange material rather than relying on the engine score alone.
Field notes
The analysis labels distinguish the engine’s top choice from moves that surrender defined amounts of winning chances; the page gives thresholds for several categories. Its board-reading examples also surface concrete counts, such as how many pieces attack and defend a pawn, and describe candidate plans with conditions that must hold.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
◉HumanPersonal, local, civic, or handmade
ƒJavaScriptBrowser-side code central
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