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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 * * Nets by Chris Bao (sscg13) * https://tests.stockfishchess.org/nns?network_name=nn-61e7af4bb97d */ !function(){function e(){"use strict";var e,r=(e=globalThis.document?.currentScript?.src,async function(r={}){var t=r,a=!!globalThis.window,n=!!globalThis.WorkerGlobalScope,o=globalThis.process?.versions?.node&&"renderer"!=globalThis.process?.type,i=n&&"em-pthread"==globalThis.name;if(o){var s=require("node:worker_threads");globalThis.Worker=s.Worker,i=(n=!s.isMainThread)&&"em-pthread"==s.workerData}"undefined"!=typeof global&&"[object process]"===Object.prototype.toString.call(global.process)&&"undefined"!=typeof fetch&&("undefined"==typeof XMLHttpRequest&&(global.XMLHttpRequest=function(){var e,r={readyState:0,status:0,onerror:null,onreadystatechange:null,onload:null,open:function(r,t){e=t},send:function(){require("fs").readFile(e,function(e,t){r.readyState=4,e?(r.status=404,r.onerror(e)):(r.status=200,r.response=t,r.onreadystatechange(),r.onload())})}};return r}),fetch=null),t.print=function(e){t.listener&&t.listener(e)},t.printErr=function(e){t.listener&&t.listener(e)},t.terminate=function(){void 0!==se&&re()};var f=[],u="./this.program",l=(e,r)=>{throw r};"undefined"!=typeof __filename?e=__filename:n&&(e=self.location.href);var c,d,h="";if(o){var m=require("node:fs");h=__dirname+"/",d=e=>(e=x(e)?new URL(e):e,m.readFileSync(e)),c=async e=>(e=x(e)?new URL(e):e,m.readFileSync(e,void 0)),process.argv.length>1&&(u=process.argv[1].replace(/\\/g,"/")),f=process.argv.slice(2),l=(e,r)=>{throw process.exitCode=e,r}}else if(a||n){try{h=new URL(".",e).href}catch{}o||(n&&(d=e=>{var r=new XMLHttpRequest;return r.open("GET",e,!1),r.responseType="arraybuffer",r.send(null),new Uint8Array(r.response)}),c=async e=>{if((e=await fetch(e,{credentials:"same-origin"})).ok)return e.arrayBuffer();throw Error(e.status+" : "+e.url)})}var p=function(){}.bind(),w=function(){}.bind();if(o){var v=require("node:util"),g=e=>"object"==typeof e?v.inspect(e):e;p=(...e)=>m.writeSync(1,e.map(g).join(" ")+"\n"),w=(...e)=>m.writeSync(2,e.map(g).join(" ")+"\n")}var y,b,k,S,$=p,A=w,T=!1,x=e=>e.startsWith("file://");function P(){oe.buffer!=B.buffer&&D()}if(o&&i){globalThis.self=globalThis;var M=s.parentPort;globalThis.postMessage||(M.on("message",e=>globalThis.onmessage?.({data:e})),globalThis.postMessage=e=>M.postMessage(e)),process.on("uncaughtException",e=>{postMessage({da:8,error:e}),process.exit(1)})}if(i){var _=!1;function vt(e){try{var r=e.data,a=r.da;if(1==a){let e=[];self.onmessage=r=>e.push(r),S=()=>{postMessage({da:3});for(let r of e)vt(r);self.onmessage=vt};for(let e of r.Ha)t[e]&&!t[e].proxy||(t[e]=(...r)=>{postMessage({da:9,Ga:e,args:r})},"print"==e&&($=t[e]),"printErr"==e&&(A=t[e]));oe=r.Va,D(),b=r.Wa,q(),wt(),S()}else if(2==a){!function(e){var r=(P(),ne)[e+48>>2];e=(P(),ne)[e+52>>2],ft(r,r-e),ut(r)}(r.ha),et(r.ha,0,0,1,0,0),ae(),br(r.ha),_||=!0;try{ue(r.Qa,r.pa)}catch(e){if("unwind"!=e)throw e}}else 4==a?_&&kr():a&&(A(`worker: received unknown command ${a}`),A(r))}catch(e){throw C&&rt(),e}}self.onunhandledrejection=e=>{throw e.reason||e},self.onmessage=vt}var E,C=!1;function D(){if(!B?.buffer?.growable){var e=oe.buffer;B=new Int8Array(e),fr=new Int16Array(e),sr=new Uint8Array(e),K=new Int32Array(e),ne=new Uint32Array(e),I=new Float64Array(e),R=new BigInt64Array(e)}}function j(){C=!0,i||(t.noFSInit||qe||(qe=!0,tr("/dev/tty","/dev/stdin"),tr("/dev/tty","/dev/stdout"),tr("/dev/tty1","/dev/stderr"),ar("/dev/stdin",0),ar("/dev/stdout",1),ar("/dev/stderr",1)),ht.F(),Le=!1)}function U(e){throw A(e=`Aborted(${e})`),T=!0,new WebAssembly.RuntimeError(e+". 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