Why It Works
Instant known-position lookup
Recognizes positions that already exist in the API so the quiz opens without waiting on a local search.
OnlyFENs
Share one sharp position at a time.
Turn any FEN into a playable chess prompt. Known positions load instantly. Unknown ones fall through to the local engine and come back as a proper quiz.
Can you find the move?
White to move and start a forcing attack.
Kingside pressure
Build the center
White to move and keep the Italian structure healthy.
Opening grip
Black to move and punish it
A one-move tactical finish from the opening.
Opening tactic
Why It Works
Local engine fallback
When the position is unknown, the browser-side engine picks up the work and turns it into a playable challenge.
Why It Works
Shareable FEN routes
Every position becomes a clean URL, so sharp moments are easy to send, reopen, and study.