Start

Board theme

Repertoire

Name I play Load on startup (default)

Mode

Spar

Correct

Wrong

—

Accuracy

Streak

1200

Rating

Drill pool

Commentary Select a move

Saved with this move. Press ⌘/Ctrl + Enter to apply.

Session

Repertoire tree

Estimates how this repertoire would score against the field at a chosen Elo: you play your prepared moves, opponents play the real move distribution, and results propagate up the tree. Unprepared replies score at the field's own rate. Positions with fewer than 5 games are reported as insufficient, never guessed.

Rating band

Time controls

First run is slow (one explorer call per line, rate-limited); cached after.

Repertoire intelligence

Are you ready for the field?

Real coverage is probability × depth. See how long games stay inside your preparation, why they leave it, and whether you can recall the moves that matter.

Repertoire

Field coverage

Where real games leave your prep

Opponent choices are weighted by the Lichess opening explorer for your selected rating and time controls.

Not just “how many lines?”We follow your exact repertoire through the real move distribution and classify every exit as a clean endpoint, a known reply with no answer, or an opponent novelty.

Recall

Do you know the moves you prepared?

Mastery weights a live Spar attempt 3× a trainer attempt. After field analysis, priority also weights how often that exact position is reached.

Sort

AI coach

Ask your coach

It reads the position on your board, your repertoires and practice record, the field at your rating band, the engine, and your real games on Lichess & Chess.com — then answers with evidence, not vibes.

The coach isn't configured on this server yet (no ANTHROPIC_API_KEY). Everything else still works.

Lichess handle Chess.com handle

Try asking:

Admin

Dashboard

Signups and how often people are actually using GambitPrep.

Users

Adoption, training volume, recall, and recent activity.

Swipe for activity

Repertoire

Session

Repertoire tree

Are you ready for the field?

Where real games leave your prep

Do you know the moves you prepared?

Ask your coach

Dashboard

Users

Feedback

Raw PGN paste / bulk-edit

Rating & time controls

Save to repertoire

Add PGN paste a study or game — we'll merge it in

Send feedback bugs, ideas, anything — it goes straight to me

Drill sets a set is a bundle of repertoires Spar picks from at random

History