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stockfish

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The Stockfish chess engine in Web Assembly (WASM)

github.com/nmrugg/stockfish.js

nmrugg/stockfish.js

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/*! * Stockfish.js 19 (c) 2026, Chess.com, LLC * https://github.com/nmrugg/stockfish.js * License: GPLv3 * * Based on Stockfish (c) T. Romstad, M. Costalba, J. Kiiski, G. Linscott and other contributors. * https://github.com/official-stockfish/Stockfish */ !function(){function e(){var e,t=(e=globalThis.document?.currentScript?.src,async function(t={}){var r=t,n=!!globalThis.window,a=!!globalThis.WorkerGlobalScope,o=globalThis.process?.versions?.node&&"renderer"!=globalThis.process?.type;"undefined"!=typeof global&&"[object process]"===Object.prototype.toString.call(global.process)&&"undefined"!=typeof fetch&&("undefined"==typeof XMLHttpRequest&&(global.XMLHttpRequest=function(){var e,t={readyState:0,status:0,onerror:null,onreadystatechange:null,onload:null,open:function(t,r){e=r},send:function(){require("fs").readFile(e,function(e,r){t.readyState=4,e?(t.status=404,t.onerror(e)):(t.status=200,t.response=r,t.onreadystatechange(),t.onload())})}};return t}),fetch=null),r.print=function(e){r.listener&&r.listener(e)},r.printErr=function(e){r.listener&&r.listener(e)},r.terminate=function(){"undefined"!=typeof PThread&&PThread.Ha()};var i=[],s="./this.program",f=(e,t)=>{throw t};"undefined"!=typeof __filename?e=__filename:a&&(e=self.location.href);var u,l,c="";if(o){var d=require("node:fs");c=__dirname+"/",l=e=>(e=y(e)?new URL(e):e,d.readFileSync(e)),u=async e=>(e=y(e)?new URL(e):e,d.readFileSync(e,void 0)),process.argv.length>1&&(s=process.argv[1].replace(/\\/g,"/")),i=process.argv.slice(2),f=(e,t)=>{throw process.exitCode=e,t}}else if(n||a){try{c=new URL(".",e).href}catch{}a&&(l=e=>{var t=new XMLHttpRequest;return t.open("GET",e,!1),t.responseType="arraybuffer",t.send(null),new Uint8Array(t.response)}),u=async e=>{if((e=await fetch(e,{credentials:"same-origin"})).ok)return e.arrayBuffer();throw Error(e.status+" : "+e.url)}}var h,m,w=function(){}.bind(),p=function(){}.bind(),v=!1,y=e=>e.startsWith("file://");function g(){if(!S?.buffer?.resizable){var e=Ke.buffer;S=new Int8Array(e),ge=new Int16Array(e),pe=new Uint8Array(e),F=new Int32Array(e),ve=new Uint32Array(e),be=new Float64Array(e),ye=new BigInt64Array(e)}}function b(e){throw p(e=`Aborted(${e})`),v=!0,new WebAssembly.RuntimeError(e+". 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