Games

Betafish.js

Chess AI tool — play against the computer, set up FEN positions, adjust AI thinking time from 1 to 10 seconds

betafish.gavinong.com

Verified

Quick facts
What is it	Chess AI tool — play against the computer, set up FEN positions, adjust AI thinking time from 1 to 10 seconds
Pricing	Unknown
Platform	Web Application
Best for	playing chess against AI to practice, analyzing chess positions by setting FEN
Domain registered	2022

Data updated Aug. 1, 2026

What does Betafish.js do?

Betafish.js is a chess AI web app that lets you play against the computer or analyze positions. You can set up any board configuration by pasting a FEN string, or just start a new game. The AI opponent calculates its next move based on the current position and a thinking time you choose.

The interface is straightforward. A chessboard shows the current state. Below, you'll find controls: Reset to start a new game, Take Back to undo moves, AI Move to have the computer suggest or make a move, and Flip to rotate the board. You can adjust the thinking time from 1 to 10 seconds — longer times mean stronger play. The status line shows whose turn it is.

This tool is great for chess players who want to practice without a physical opponent. Beginners can learn by seeing the AI's moves, while advanced players can set up specific positions to test tactics. Developers might also find it useful for understanding how a chess engine works in a browser. It is simple, focused, and does one thing well: play chess.

Games

#ai opponent#board-game#chess#fen-notation#javascript#move-suggestion#web app

Key features

What makes it stand out

Play against a chess AI opponent with adjustable difficulty (1-10 second thinking time)

Set up custom board positions using FEN notation

Take back moves and flip the board for different perspectives

Get AI move suggestions with a single click

Reset game or copy FEN for sharing positions

Who is Betafish.js for?

Who benefits most from this tool

playing chess against AI to practice

analyzing chess positions by setting FEN

testing chess opening or endgame tactics

Trust & presence

Domain Domain registered 2022

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