Wordfeud solver

Use it: https://bertblookers.github.io/wordfeud-solver/ (a work in progress)

A web app that recreates a Wordfeud game (or a game of Dutch Scrabble on a real board) and lists the best-scoring moves, using the OpenTaal Dutch word list. The interface is in Dutch.

It runs entirely in your browser: no account, no install, no server of its own. Your games and the words you remove are saved in your browser's own storage on your device and never leave it. The page sends no analytics; the only download beyond the page itself is the word list.

What it does

• Board. Set the bonus squares (DL, TL, DW, TW) one square at a time, or start from the standard Wordfeud or Scrabble layout. Type the letters on the board (on a phone, tap a square to open the keyboard); * marks a tile as a blank.
• Rack ("Jouw letters"): up to 7 letters, ? for a blank.
• Best moves ("Beste zetten"): every legal move with its score and position. Click one to preview it on the board; "Zet spelen" plays it. The "Open" column counts the empty squares next to a tile after the move, where a reply can start. Two optional columns: "Tegen" (the most replies the opponent could have, over every rack they could hold; a lower bound when it runs out of time) and "Zelf" (how many moves you could play next turn, from lowest to highest over the tiles you might draw).
• Tiles. "Resterende letters" shows how many of each tile are not yet in sight; "Stenen van de tegenstander" shows the tiles the opponent must hold.
• Score ("Stand"): both players' totals and a log of the moves, scored by the game's rules (cross words, bonuses on new tiles only, the bingo bonus).
• Variants ("Instellingen"): Wordfeud (104 tiles, bingo +40) or the Dutch Scrabble set (102 tiles, bingo +50), set per game.
• Word list curation. When Wordfeud rejects a suggested word, the bin icon removes it from your copy of the list; your removals are kept in your browser.
• Games are saved as you go. "Nieuw spel" starts a new game; older games stay in the list.

The word list

• Source: the OpenTaal word list, offered under the BSD 3-Clause License or CC BY 3.0. It is not in this repository: on your first visit, your browser downloads OpenTaal's wordlist.txt from OpenTaal's own repository, at one fixed commit (b250510dda431785f962019167d1415198ff3905), and checks its SHA-256 before using it. If that download fails or doesn't match, it takes the same file at the same commit from jsDelivr.
• The page then filters it: it drops words with a capital letter (abbreviations, names), takes the accents off (café becomes cafe, as Wordfeud does), keeps a to z only and lengths 2 to 15, and leaves out doubles. The filtered list stays in your browser's cache, so a later visit doesn't download it again.
• OpenTaal is not Wordfeud's own word list, so now and then a word differs: accepted here but not in Wordfeud, or the other way round.

How it works

• index.html: the whole interface in one file, plain JavaScript.
• solver.mjs: the move generator, pure and without I/O: a trie and anchor squares with cross-checks (Appel and Jacobson's method), scoring, blanks, the tile sets of both variants, the opponent analysis and the word list filter.
• solver.worker.mjs: a Web Worker that builds its own trie and runs the search, and the "Tegen" and "Zelf" columns, outside the page's main thread.
• store-browser.mjs: the saved games and removed words in your browser's storage, and the word list loader.

Data & attribution

See ATTRIBUTION.md.

License

The code is licensed under the GNU Affero General Public License v3.0; see LICENSE. SPDX: AGPL-3.0-only.