chess-analysis-board/dist/index.js

A comprehensive chess analysis board React component with move navigation, variation support, PGN import/export, and customizable keyboard shortcuts

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 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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wn{constructor(t,s){Ne(this,"color");Ne(this,"from");Ne(this,"to");Ne(this,"piece");Ne(this,"captured");Ne(this,"promotion");Ne(this,"flags");Ne(this,"san");Ne(this,"lan");Ne(this,"before");Ne(this,"after");const{color:a,piece:l,from:u,to:p,flags:g,captured:b,promotion:S}=s,E=ze(u),N=ze(p);this.color=a,this.piece=l,this.from=E,this.to=N,this.san=t._moveToSan(s,t._moves({legal:!0})),this.lan=E+N,this.before=t.fen(),t._makeMove(s),this.after=t.fen(),t._undoMove(),this.flags="";for(const _ in le)le[_]&g&&(this.flags+=Qt[_]);b&&(this.captured=b),S&&(this.promotion=S,this.lan+=S)}isCapture(){return this.flags.indexOf(Qt.CAPTURE)>-1}isPromotion(){return this.flags.indexOf(Qt.PROMOTION)>-1}isEnPassant(){return this.flags.indexOf(Qt.EP_CAPTURE)>-1}isKingsideCastle(){return this.flags.indexOf(Qt.KSIDE_CASTLE)>-1}isQueensideCastle(){return this.flags.indexOf(Qt.QSIDE_CASTLE)>-1}isBigPawn(){return this.flags.indexOf(Qt.BIG_PAWN)>-1}}const Ge=-1,Qt={NORMAL:"n",CAPTURE:"c",BIG_PAWN:"b",EP_CAPTURE:"e",PROMOTION:"p",KSIDE_CASTLE:"k",QSIDE_CASTLE:"q",NULL_MOVE:"-"},le={NORMAL:1,CAPTURE:2,BIG_PAWN:4,EP_CAPTURE:8,PROMOTION:16,KSIDE_CASTLE:32,QSIDE_CASTLE:64,NULL_MOVE:128},As={Event:"?",Site:"?",Date:"????.??.??",Round:"?",White:"?",Black:"?",Result:"*"},Vv={WhiteTitle:null,BlackTitle:null,WhiteElo:null,BlackElo:null,WhiteUSCF:null,BlackUSCF:null,WhiteNA:null,BlackNA:null,WhiteType:null,BlackType:null,EventDate:null,EventSponsor:null,Section:null,Stage:null,Board:null,Opening:null,Variation:null,SubVariation:null,ECO:null,NIC:null,Time:null,UTCTime:null,UTCDate:null,TimeControl:null,SetUp:null,FEN:null,Termination:null,Annotator:null,Mode:null,PlyCount:null},Gv={...As,...Vv},ae={a8:0,b8:1,c8:2,d8:3,e8:4,f8:5,g8:6,h8:7,a7:16,b7:17,c7:18,d7:19,e7:20,f7:21,g7:22,h7:23,a6:32,b6:33,c6:34,d6:35,e6:36,f6:37,g6:38,h6:39,a5:48,b5:49,c5:50,d5:51,e5:52,f5:53,g5:54,h5:55,a4:64,b4:65,c4:66,d4:67,e4:68,f4:69,g4:70,h4:71,a3:80,b3:81,c3:82,d3:83,e3:84,f3:85,g3:86,h3:87,a2:96,b2:97,c2:98,d2:99,e2:100,f2:101,g2:102,h2:103,a1:112,b1:113,c1:114,d1:115,e1:116,f1:117,g1:118,h1:119},ms={b:[16,32,17,15],w:[-16,-32,-17,-15]},Da={n:[-18,-33,-31,-14,18,33,31,14],b:[-17,-15,17,15],r:[-16,1,16,-1],q:[-17,-16,-15,1,17,16,15,-1],k:[-17,-16,-15,1,17,16,15,-1]},Yv=[20,0,0,0,0,0,0,24,0,0,0,0,0,0,20,0,0,20,0,0,0,0,0,24,0,0,0,0,0,20,0,0,0,0,20,0,0,0,0,24,0,0,0,0,20,0,0,0,0,0,0,20,0,0,0,24,0,0,0,20,0,0,0,0,0,0,0,0,20,0,0,24,0,0,20,0,0,0,0,0,0,0,0,0,0,20,2,24,2,20,0,0,0,0,0,0,0,0,0,0,0,2,53,56,53,2,0,0,0,0,0,0,24,24,24,24,24,24,56,0,56,24,24,24,24,24,24,0,0,0,0,0,0,2,53,56,53,2,0,0,0,0,0,0,0,0,0,0,0,20,2,24,2,20,0,0,0,0,0,0,0,0,0,0,20,0,0,24,0,0,20,0,0,0,0,0,0,0,0,20,0,0,0,24,0,0,0,20,0,0,0,0,0,0,20,0,0,0,0,24,0,0,0,0,20,0,0,0,0,20,0,0,0,0,0,24,0,0,0,0,0,20,0,0,20,0,0,0,0,0,0,24,0,0,0,0,0,0,20],Qv=[17,0,0,0,0,0,0,16,0,0,0,0,0,0,15,0,0,17,0,0,0,0,0,16,0,0,0,0,0,15,0,0,0,0,17,0,0,0,0,16,0,0,0,0,15,0,0,0,0,0,0,17,0,0,0,16,0,0,0,15,0,0,0,0,0,0,0,0,17,0,0,16,0,0,15,0,0,0,0,0,0,0,0,0,0,17,0,16,0,15,0,0,0,0,0,0,0,0,0,0,0,0,17,16,15,0,0,0,0,0,0,0,1,1,1,1,1,1,1,0,-1,-1,-1,-1,-1,-1,-1,0,0,0,0,0,0,0,-15,-16,-17,0,0,0,0,0,0,0,0,0,0,0,0,-15,0,-16,0,-17,0,0,0,0,0,0,0,0,0,0,-15,0,0,-16,0,0,-17,0,0,0,0,0,0,0,0,-15,0,0,0,-16,0,0,0,-17,0,0,0,0,0,0,-15,0,0,0,0,-16,0,0,0,0,-17,0,0,0,0,-15,0,0,0,0,0,-16,0,0,0,0,0,-17,0,0,-15,0,0,0,0,0,0,-16,0,0,0,0,0,0,-17],Xv={p:1,n:2,b:4,r:8,q:16,k:32},Jv="pnbrqkPNBRQK",ka=[js,Dn,Mr,Wt],Zv=7,e1=6,t1=1,r1=0,_n={[Ke]:le.KSIDE_CASTLE,[Wt]:le.QSIDE_CASTLE},Bt={w:[{square:ae.a1,flag:le.QSIDE_CASTLE},{square:ae.h1,flag:le.KSIDE_CASTLE}],b:[{square:ae.a8,flag:le.QSIDE_CASTLE},{square:ae.h8,flag:le.KSIDE_CASTLE}]},n1={b:t1,w:e1},bs="--";function Zt(i){return i>>4}function Hr(i){return i&15}function cl(i){return"0123456789".indexOf(i)!==-1}function ze(i){const t=Hr(i),s=Zt(i);return"abcdefgh".substring(t,t+1)+"87654321".substring(s,s+1)}function Rr(i){return i===Ze?ut:Ze}function s1(i){const t=i.split(/\s+/);if(t.length!==6)return{ok:!1,error:"Invalid FEN: must contain six space-delimited fields"};const s=parseInt(t[5],10);if(isNaN(s)||s<=0)return{ok:!1,error:"Invalid FEN: move number must be a positive integer"};const a=parseInt(t[4],10);if(isNaN(a)||a<0)return{ok:!1,error:"Invalid FEN: half move counter number must be a non-negative integer"};if(!/^(-|[abcdefgh][36])$/.test(t[3]))return{ok:!1,error:"Invalid FEN: en-passant square is invalid"};if(/[^kKqQ-]/.test(t[2]))return{ok:!1,error:"Invalid FEN: castling availability is invalid"};if(!/^(w|b)$/.test(t[1]))return{ok:!1,error:"Invalid FEN: side-to-move is invalid"};const l=t[0].split("/");if(l.length!==8)return{ok:!1,error:"Invalid FEN: piece data does not contain 8 '/'-delimited rows"};for(let p=0;p<l.length;p++){let g=0,b=!1;for(let S=0;S<l[p].length;S++)if(cl(l[p][S])){if(b)return{ok:!1,error:"Invalid FEN: piece data is invalid (consecutive number)"};g+=parseInt(l[p][S],10),b=!0}else{if(!/^[prnbqkPRNBQK]$/.test(l[p][S]))return{ok:!1,error:"Invalid FEN: piece data is invalid (invalid piece)"};g+=1,b=!1}if(g!==8)return{ok:!1,error:"Invalid FEN: piece data is invalid (too many squares in rank)"}}if(t[3][1]=="3"&&t[1]=="w"||t[3][1]=="6"&&t[1]=="b")return{ok:!1,error:"Invalid FEN: illegal en-passant square"};const u=[{color:"white",regex:/K/g},{color:"black",regex:/k/g}];for(const{color:p,regex:g}of u){if(!g.test(t[0]))return{ok:!1,error:`Invalid FEN: missing ${p} king`};if((t[0].match(g)||[]).length>1)return{ok:!1,error:`Invalid FEN: too many ${p} kings`}}return Array.from(l[0]+l[7]).some(p=>p.toUpperCase()==="P")?{ok:!1,error:"Invalid FEN: some pawns are on the edge rows"}:{ok:!0}}function i1(i,t){const s=i.from,a=i.to,l=i.piece;let u=0,p=0,g=0;for(let b=0,S=t.length;b<S;b++){const E=t[b].from,N=t[b].to,_=t[b].piece;l===_&&s!==E&&a===N&&(u++,Zt(s)===Zt(E)&&p++,Hr(s)===Hr(E)&&g++)}return u>0?p>0&&g>0?ze(s):g>0?ze(s).charAt(1):ze(s).charAt(0):""}function Ut(i,t,s,a,l,u=void 0,p=le.NORMAL){const g=Zt(a);if(l===Be&&(g===Zv||g===r1))for(let b=0;b<ka.length;b++){const S=ka[b];i.push({color:t,from:s,to:a,piece:l,captured:u,promotion:S,flags:p|le.PROMOTION})}else i.push({color:t,from:s,to:a,piece:l,captured:u,flags:p})}function Na(i){let t=i.charAt(0);return t>="a"&&t<="h"?i.match(/[a-h]\d.*[a-h]\d/)?void 0:Be:(t=t.toLowerCase(),t==="o"?Ke:t)}function ys(i){return i.replace(/=/,"").replace(/[+#]?[?!]*$/,"")}class Xt{constructor(t=vs,{skipValidation:s=!1}={}){Ne(this,"_board",new Array(128));Ne(this,"_turn",Ze);Ne(this,"_header",{});Ne(this,"_kings",{w:Ge,b:Ge});Ne(this,"_epSquare",-1);Ne(this,"_halfMoves",0);Ne(this,"_moveNumber",0);Ne(this,"_history",[]);Ne(this,"_comments",{});Ne(this,"_castling",{w:0,b:0});Ne(this,"_hash",0n);Ne(this,"_positionCount",new Map);this.load(t,{skipValidation:s})}clear({preserveHeaders:t=!1}={}){this._board=new Array(128),this._kings={w:Ge,b:Ge},this._turn=Ze,this._castling={w:0,b:0},this._epSquare=Ge,this._halfMoves=0,this._moveNumber=1,this._history=[],this._comments={},this._header=t?this._header:{...Gv},this._hash=this._computeHash(),this._positionCount=new Map,this._header.SetUp=null,this._header.FEN=null}load(t,{skipValidation:s=!1,preserveHeaders:a=!1}={}){let l=t.split(/\s+/);if(l.length>=2&&l.length<6){const g=["-","-","0","1"];t=l.concat(g.slice(-(6-l.length))).join(" ")}if(l=t.split(/\s+/),!s){const{ok:g,error:b}=s1(t);if(!g)throw new Error(b)}const u=l[0];let p=0;this.clear({preserveHeaders:a});for(let g=0;g<u.length;g++){const b=u.charAt(g);if(b==="/")p+=8;else if(cl(b))p+=parseInt(b,10);else{const S=b<"a"?Ze:ut;this._put({type:b.toLowerCase(),color:S},ze(p)),p++}}this._turn=l[1],l[2].indexOf("K")>-1&&(this._castling.w|=le.KSIDE_CASTLE),l[2].indexOf("Q")>-1&&(this._castling.w|=le.QSIDE_CASTLE),l[2].indexOf("k")>-1&&(this._castling.b|=le.KSIDE_CASTLE),l[2].indexOf("q")>-1&&(this._castling.b|=le.QSIDE_CASTLE),this._epSquare=l[3]==="-"?Ge:ae[l[3]],this._halfMoves=parseInt(l[4],10),this._moveNumber=parseInt(l[5],10),this._hash=this._computeHash(),this._updateSetup(t),this._incPositionCount()}fen({forceEnpassantSquare:t=!1}={}){var p,g;let s=0,a="";for(let b=ae.a8;b<=ae.h1;b++){if(this._board[b]){s>0&&(a+=s,s=0);const{color:S,type:E}=this._board[b];a+=S===Ze?E.toUpperCase():E.toLowerCase()}else s++;b+1&136&&(s>0&&(a+=s),b!==ae.h1&&(a+="/"),s=0,b+=8)}let l="";this._castling[Ze]&le.KSIDE_CASTLE&&(l+="K"),this._castling[Ze]&le.QSIDE_CASTLE&&(l+="Q"),this._castling[ut]&le.KSIDE_CASTLE&&(l+="k"),this._castling[ut]&le.QSIDE_CASTLE&&(l+="q"),l=l||"-";let u="-";if(this._epSquare!==Ge)if(t)u=ze(this._epSquare);else{const b=this._epSquare+(this._turn===Ze?16:-16),S=[b+1,b-1];for(const E of S){if(E&136)continue;const N=this._turn;if(((p=this._board[E])==null?void 0:p.color)===N&&((g=this._board[E])==null?void 0:g.type)===Be){this._makeMove({color:N,from:E,to:this._epSquare,piece:Be,captured:Be,flags:le.EP_CAPTURE});const _=!this._isKingAttacked(N);if(this._undoMove(),_){u=ze(this._epSquare);break}}}}return[a,this._turn,l,u,this._halfMoves,this._moveNumber].join(" ")}_pieceKey(t){if(!this._board[t])return 0n;const{color:s,type:a}=this._board[t],l={w:0,b:1}[s],u={p:0,n:1,b:2,r:3,q:4,k:5}[a];return qv[l][u][t]}_epKey(){return this._epSquare===Ge?0n:Hv[this._epSquare&7]}_castlingKey(){const t=this._castling.w>>5|this._castling.b>>3;return zv[t]}_computeHash(){let t=0n;for(let s=ae.a8;s<=ae.h1;s++){if(s&136){s+=7;continue}this._board[s]&&(t^=this._pieceKey(s))}return t^=this._epKey(),t^=this._castlingKey(),this._turn==="b"&&(t^=ps),t}_updateSetup(t){this._history.length>0||(t!==vs?(this._header.SetUp="1",this._header.FEN=t):(this._header.SetUp=null,this._header.FEN=null))}reset(){this.load(vs)}get(t){return this._board[ae[t]]}findPiece(t){var a;const s=[];for(let l=ae.a8;l<=ae.h1;l++){if(l&136){l+=7;continue}!this._board[l]||((a=this._board[l])==null?void 0:a.color)!==t.color||this._board[l].color===t.color&&this._board[l].type===t.type&&s.push(ze(l))}return s}put({type:t,color:s},a){return this._put({type:t,color:s},a)?(this._updateCastlingRights(),this._updateEnPassantSquare(),this._updateSetup(this.fen()),!0):!1}_set(t,s){this._hash^=this._pieceKey(t),this._board[t]=s,this._hash^=this._pieceKey(t)}_put({type:t,color:s},a){if(Jv.indexOf(t.toLowerCase())===-1||!(a in ae))return!1;const l=ae[a];if(t==Ke&&!(this._kings[s]==Ge||this._kings[s]==l))return!1;const u=this._board[l];return u&&u.type===Ke&&(this._kings[u.color]=Ge),this._set(l,{type:t,color:s}),t===Ke&&(this._kings[s]=l),!0}_clear(t){this._hash^=this._pieceKey(t),delete this._board[t]}remove(t){const s=this.get(t);return this._clear(ae[t]),s&&s.type===Ke&&(this._kings[s.color]=Ge),this._updateCastlingRights(),this._updateEnPassantSquare(),this._updateSetup(this.fen()),s}_updateCastlingRights(){var a,l,u,p,g,b,S,E,N,_,A,x;this._hash^=this._castlingKey();const t=((a=this._board[ae.e1])==null?void 0:a.type)===Ke&&((l=this._board[ae.e1])==null?void 0:l.color)===Ze,s=((u=this._board[ae.e8])==null?void 0:u.type)===Ke&&((p=this._board[ae.e8])==null?void 0:p.color)===ut;(!t||((g=this._board[ae.a1])==null?void 0:g.type)!==Mr||((b=this._board[ae.a1])==null?void 0:b.color)!==Ze)&&(this._castling.w&=-65),(!t||((S=this._board[ae.h1])==null?void 0:S.type)!==Mr||((E=this._board[ae.h1])==null?void 0:E.color)!==Ze)&&(this._castling.w&=-33),(!s||((N=this._board[ae.a8])==null?void 0:N.type)!==Mr||((_=this._board[ae.a8])==null?void 0:_.color)!==ut)&&(this._castling.b&=-65),(!s||((A=this._board[ae.h8])==null?void 0:A.type)!==Mr||((x=this._board[ae.h8])==null?void 0:x.color)!==ut)&&(this._castling.b&=-33),this._hash^=this._castlingKey()}_updateEnPassantSquare(){var u,p;if(this._epSquare===Ge)return;const t=this._epSquare+(this._turn===Ze?-16:16),s=this._epSquare+(this._turn===Ze?16:-16),a=[s+1,s-1];if(this._board[t]!==null||this._board[this._epSquare]!==null||((u=this._board[s])==null?void 0:u.color)!==Rr(this._turn)||((p=this._board[s])==null?void 0:p.type)!==Be){this._hash^=this._epKey(),this._epSquare=Ge;return}const l=g=>{var b,S;return!(g&136)&&((b=this._board[g])==null?void 0:b.color)===this._turn&&((S=this._board[g])==null?void 0:S.type)===Be};a.some(l)||(this._hash^=this._epKey(),this._epSquare=Ge)}_attacked(t,s,a){const l=[];for(let u=ae.a8;u<=ae.h1;u++){if(u&136){u+=7;continue}if(this._board[u]===void 0||this._board[u].color!==t)continue;const p=this._board[u],g=u-s;if(g===0)continue;const b=g+119;if(Yv[b]&Xv[p.type]){if(p.type===Be){if(g>0&&p.color===Ze||g<=0&&p.color===ut)if(a)l.push(ze(u));else return!0;continue}if(p.type==="n"||p.type==="k")if(a){l.push(ze(u));continue}else return!0;const S=Qv[b];let E=u+S,N=!1;for(;E!==s;){if(this._board[E]!=null){N=!0;break}E+=S}if(!N)if(a){l.push(ze(u));continue}else return!0}}return a?l:!1}attackers(t,s){return s?this._attacked(s,ae[t],!0):this._attacked(this._turn,ae[t],!0)}_isKingAttacked(t){const s=this._kings[t];return s===-1?!1:this._attacked(Rr(t),s)}hash(){return this._hash.toString(16)}isAttacked(t,s){return this._attacked(s,ae[t])}isCheck(){return this._isKingAttacked(this._turn)}inCheck(){return this.isCheck()}isCheckmate(){return this.isCheck()&&this._moves().length===0}isStalemate(){return!this.isCheck()&&this._moves().length===0}isInsufficientMaterial(){const t={b:0,n:0,r:0,q:0,k:0,p:0},s=[];let a=0,l=0;for(let u=ae.a8;u<=ae.h1;u++){if(l=(l+1)%2,u&136){u+=7;continue}const p=this._board[u];p&&(t[p.type]=p.type in t?t[p.type]+1:1,p.type===Dn&&s.push(l),a++)}if(a===2)return!0;if(a===3&&(t[Dn]===1||t[js]===1))return!0;if(a===t[Dn]+2){let u=0;const p=s.length;for(let g=0;g<p;g++)u+=s[g];if(u===0||u===p)return!0}return!1}isThreefoldRepetition(){return this._getPositionCount(this._hash)>=3}isDrawByFiftyMoves(){return this._halfMoves>=100}isDraw(){return this.isDrawByFiftyMoves()||this.isStalemate()||this.isInsufficientMaterial()||this.isThreefoldRepetition()}isGameOver(){return this.isCheckmate()||this.isDraw()}moves({verbose:t=!1,square:s=void 0,piece:a=void 0}={}){const l=this._moves({square:s,piece:a});return t?l.map(u=>new wn(this,u)):l.map(u=>this._moveToSan(u,l))}_moves({legal:t=!0,piece:s=void 0,square:a=void 0}={}){var A;const l=a?a.toLowerCase():void 0,u=s==null?void 0:s.toLowerCase(),p=[],g=this._turn,b=Rr(g);let S=ae.a8,E=ae.h1,N=!1;if(l)if(l in ae)S=E=ae[l],N=!0;else return[];for(let x=S;x<=E;x++){if(x&136){x+=7;continue}if(!this._board[x]||this._board[x].color===b)continue;const{type:j}=this._board[x];let W;if(j===Be){if(u&&u!==j)continue;W=x+ms[g][0],this._board[W]||(Ut(p,g,x,W,Be),W=x+ms[g][1],n1[g]===Zt(x)&&!this._board[W]&&Ut(p,g,x,W,Be,void 0,le.BIG_PAWN));for(let U=2;U<4;U++)W=x+ms[g][U],!(W&136)&&(((A=this._board[W])==null?void 0:A.color)===b?Ut(p,g,x,W,Be,this._board[W].type,le.CAPTURE):W===this._epSquare&&Ut(p,g,x,W,Be,Be,le.EP_CAPTURE))}else{if(u&&u!==j)continue;for(let U=0,q=Da[j].length;U<q;U++){const K=Da[j][U];for(W=x;W+=K,!(W&136);){if(!this._board[W])Ut(p,g,x,W,j);else{if(this._board[W].color===g)break;Ut(p,g,x,W,j,this._board[W].type,le.CAPTURE);break}if(j===js||j===Ke)break}}}}if((u===void 0||u===Ke)&&(!N||E===this._kings[g])){if(this._castling[g]&le.KSIDE_CASTLE){const x=this._kings[g],j=x+2;!this._board[x+1]&&!this._board[j]&&!this._attacked(b,this._kings[g])&&!this._attacked(b,x+1)&&!this._attacked(b,j)&&Ut(p,g,this._kings[g],j,Ke,void 0,le.KSIDE_CASTLE)}if(this._castling[g]&le.QSIDE_CASTLE){const x=this._kings[g],j=x-2;!this._board[x-1]&&!this._board[x-2]&&!this._board[x-3]&&!this._attacked(b,this._kings[g])&&!this._attacked(b,x-1)&&!this._attacked(b,j)&&Ut(p,g,this._kings[g],j,Ke,void 0,le.QSIDE_CASTLE)}}if(!t||this._kings[g]===-1)return p;const _=[];for(let x=0,j=p.length;x<j;x++)this._makeMove(p[x]),this._isKingAttacked(g)||_.push(p[x]),this._undoMove();return _}move(t,{strict:s=!1}={}){let a=null;if(typeof t=="string")a=this._moveFromSan(t,s);else if(t===null)a=this._moveFromSan(bs,s);else if(typeof t=="object"){const u=this._moves();for(let p=0,g=u.length;p<g;p++)if(t.from===ze(u[p].from)&&t.to===ze(u[p].to)&&(!("promotion"in u[p])||t.promotion===u[p].promotion)){a=u[p];break}}if(!a)throw typeof t=="string"?new Error(`Invalid move: ${t}`):new Error(`Invalid move: ${JSON.stringify(t)}`);if(this.isCheck()&&a.flags&le.NULL_MOVE)throw new Error("Null move not allowed when in check");const l=new wn(this,a);return this._makeMove(a),this._incPositionCount(),l}_push(t){this._history.push({move:t,kings:{b:this._kings.b,w:this._kings.w},turn:this._turn,castling:{b:this._castling.b,w:this._castling.w},epSquare:this._epSquare,halfMoves:this._halfMoves,moveNumber:this._moveNumber})}_movePiece(t,s){this._hash^=this._pieceKey(t),this._board[s]=this._board[t],delete this._board[t],this._hash^=this._pieceKey(s)}_makeMove(t){var l,u,p,g;const s=this._turn,a=Rr(s);if(this._push(t),t.flags&le.NULL_MOVE){s===ut&&this._moveNumber++,this._halfMoves++,this._turn=a,this._epSquare=Ge;return}if(this._hash^=this._epKey(),this._hash^=this._castlingKey(),t.captured&&(this._hash^=this._pieceKey(t.to)),this._movePiece(t.from,t.to),t.flags&le.EP_CAPTURE&&(this._turn===ut?this._clear(t.to-16):this._clear(t.to+16)),t.promotion&&(this._clear(t.to),this._set(t.to,{type:t.promotion,color:s})),this._board[t.to].type===Ke){if(this._kings[s]=t.to,t.flags&le.KSIDE_CASTLE){const b=t.to-1,S=t.to+1;this._movePiece(S,b)}else if(t.flags&le.QSIDE_CASTLE){const b=t.to+1,S=t.to-2;this._movePiece(S,b)}this._castling[s]=0}if(this._castling[s]){for(let b=0,S=Bt[s].length;b<S;b++)if(t.from===Bt[s][b].square&&this._castling[s]&Bt[s][b].flag){this._castling[s]^=Bt[s][b].flag;break}}if(this._castling[a]){for(let 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