strryke / betafish

A chess engine and AI move finder written in Javascript. Beats Stockfish level 6 on Lichess.

Hi 👋, I'm Gavin.

CS student @ SUTD. Mostly, I build stuff that lives on the web.

 

betafish's Issues

How do I use this library?

npm i betafish doesn't work, how can i use it in my project

please add a copyright / license notice

Thanks for this cool project!

Incorrect calculation of the next move

Hi Gavin,
Thanks so much for developing this tiny but powerful engine.

I have been enjoying using it, however, today I noticed that the engine calculates the next move of the below position very much incorrectly.
Position: 2k4r/2p1bpp1/p7/1p2n2b/3pPP2/P2P3q/1PP4N/R3QRK1 b - f3 0 24

I checked it with the two engines below and they didn't suggest that move even with the lowest rating (1300):

• https://nextchessmove.com
• https://www.365chess.com/play_computer_online.php

I also maxed "thinking time", but got the same result.
I am not sure if you answer this type of question, but thought I ask anyway since it looks like a bug.

Appreciated!

Browser chess championship

Fantastic work!

An idea popped up while testing it. How about organizing browser chess chanmpionship. Instead of chess engines, it is browsers competing with the same chess engine (betafish). The reason it would work is mainstream browsers (Chrome/Firefox/Safari) have different implementations of javascript engine which would produce a difference in performance with a fixed time allotment (say 1s).

That way we could get Browser Elo!

makeAIMove doesn't make move

Issue: Upon calling game.makeAIMove on a game with FEN of rrrrkrrr/rrrRrrrr/8/8/8/8/RRR1RRRR/RRRRKRRR b Qq - 0 0 It results in the variable bestMove to be 0 in the function. You can test this on the betafish.js website where after you set the FEN when you click "AI Move" nothing happens and no pieces are moved.

After digging, I found that the early return was due to the time being exceeded in the CheckUp function. However I still don't know how to resolve this problem, and for the FEN above, increasing the time to 200s didn't resolve the problem