Betafish.js | Chess AI
Betafish.js, also referred to as Chess AI, is a specialized Artificial Intelligence system with a specific focus on the game of chess. It provides an interactive web-based chessboard.
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What is Betafish.js | Chess AI?
Betafish.js | Chess AI is a chess engine and AI move finder written entirely in JavaScript, designed to run directly in your web browser without requiring any downloads or server calls. Developed by Gavin Ong, it uses the Negamax algorithm with alpha-beta pruning and MVV-LVA move ordering heuristic to evaluate chess positions and generate strong moves. The estimated Elo rating is around 1800-2000 depending on thinking time.
Betafish.js | Chess AI pricing
Pricing model: Free
Betafish.js is completely free forever with no payment method required. There are no paid plans, subscriptions, or premium tiers. All features including configurable thinking times, FEN position setup, game controls, and AI play are available at no cost. The platform requires no account creation and has no usage limitations.
Betafish.js | Chess AI pros
- Completely free with no payment required
- Runs entirely in browser with no downloads needed
- JavaScript implementation works on any modern browser
- Client-side computation ensures fast response times
- No server calls required for privacy
- Beats Stockfish Level 6 on Lichess
- Estimated Elo 1800-2000 depending on thinking time
- Four configurable thinking time options (1s, 3s, 5s, 10s)
- Copy and set FEN positions for custom setups
- Take back moves to explore variations
- AI move flip feature to learn from strategies
- Reset game functionality for quick new matches
- Flip board to view from either side
- Open-source code available on GitHub
- Lightweight and highly portable
- No account or registration required
- Suitable for beginners and experienced players
- Great for educational projects and demonstrations
Betafish.js | Chess AI cons
- Limited to JavaScript implementation only
- No mobile app available
- No tournament or multiplayer mode
- No game history saving feature
- No built-in puzzle or tactical training
- No opening book or database integration
- No endgame tablebase support
- Lower strength than top chess engines like Stockfish
- No analysis board with evaluation bar
- No PGN export or import functionality
- No customizable AI playing style options
- No voice or chat features
- Limited to single player against AI
- No coaching or lesson content included
- No rating system or progress tracking
Frequently asked questions about Betafish.js | Chess AI
What is Betafish.js?
Betafish.js is a chess engine and AI move finder written entirely in JavaScript that runs in your web browser. It uses the Negamax algorithm with alpha-beta pruning and can beat Stockfish Level 6 on Lichess with an estimated Elo of 1800-2000.
Is Betafish.js free to use?
Yes, Betafish.js is completely free forever with no payment required. There are no paid plans, subscriptions, or premium features. All functionality is available at no cost without needing to create an account.
Do I need to download anything to use Betafish.js?
No, Betafish.js is a web-based application that runs entirely in your browser. No downloads, installations, or additional software are required. Just visit betafish.gavinong.com and start playing.
What thinking time options are available?
Betafish.js offers four configurable thinking time options: 1 second, 3 seconds, 5 seconds, and 10 seconds. Longer thinking times generally result in stronger play as the AI can evaluate more positions.
How strong is the Betafish.js AI?
Betafish.js has an estimated Elo rating of 1800-2000 depending on the thinking time afforded. It is strong enough to beat Stockfish Level 6 on Lichess, making it challenging for intermediate to advanced players.
Can I set up custom board positions?
Yes, Betafish.js supports FEN (Forsyth-Edwards Notation) strings. You can copy the current position's FEN or set a custom FEN to create specific board setups for analysis or practice.
Who created Betafish.js?
Betafish.js was developed by Gavin Ong. The source code is publicly available on GitHub, allowing developers to study, modify, or contribute to the chess engine.
Does Betafish.js work on mobile devices?
Betafish.js works in any modern web browser, including mobile browsers. However, it is primarily designed as a web application without a dedicated mobile app, so the experience may vary on smaller screens.
Can I take back moves or undo mistakes?
Yes, Betafish.js includes a 'Take Back' button that allows you to undo moves and explore different variations. This feature is useful for learning from mistakes and analyzing alternative decisions.
Is the source code available?
Yes, the Betafish.js source code is open-source and available on GitHub under the repository Strryke/betafish. Developers can examine the JavaScript implementation, study the Negamax algorithm usage, and contribute to the project.