Board-game word coach: enter the board and your rack, rank every legal play with leave and defense estimates, and export a ready-to-paste prompt for Claude strategy advice.

Screbbla

Goal

A coach for real-world word-tile board games. You type in the board and your rack, a solver finds and ranks every legal play, and the app can export the position as a prompt to paste into Claude for strategy and blocking advice.

Current state

Built and working. Everything runs in your browser: no accounts, no server, no analytics.

Exact move generation on a 15x15 board, with cross-words, blanks, premium squares and the 50-point bingo bonus.
Calculator mode by default: tap a square and type tiles straight onto the board (tap the same square again to switch across/down). Optional play-by-play mode in Settings tracks scores and turns.
Equity ranking (score plus a heuristic value for the tiles you keep) and an optional defense check that samples opponent racks.
Unseen-tile tracker, bag estimate and undo.
Autosave, multiple named games, save points, JSON export and import for single games and full backups.
Settings for theme, default players, moves shown, ranking, defense strength and the Claude prompt.

Using it

Put tiles on the board: tap a square and type. Use ? before a letter for a blank.
Your turn: type your rack (? is a blank), tap Find moves, tap a play to preview it, optionally Check defense, then Place on board.
Strategy help: tap Copy for Claude and paste the result into a chat.

Word list

The bundled word list (words.txt) is a public-domain placeholder and is missing some newer words such as QI, ZA, EW and OK. To match your table's dictionary, load your own list under Settings > Word list. It is kept in this browser only and is not part of backups.

Notes

Games and settings live in this browser's localStorage under keys starting with screbbla-. Export before clearing site data or switching devices.
No exchange or pass advice and no endgame solver yet. Leave values are static heuristics, and the defense check uses a small random sample.
Source: tools/public/screbbla/ in the toolbox repo (Next.js, exported as static files).

Changelog

v1 — migrated into the toolbox from the standalone Scrabble Coach app and renamed Screbbla.