function makeMove(variant: VariantKey, board: Board, uci: string) {
  if (!board.turn) board.fmvn++;
  const turn = board.turn = !board.turn;

  if (uci.includes('@')) {
    board.pieces[square(uci.slice(2, 4))] = (turn ? uci[0].toLowerCase() : uci[0]) as Piece;
    return;
  }

  const move = decomposeUci(uci),
  from = square(move[0]),
  p = board.pieces[from];

  let to = square(move[1]),
  capture = board.pieces[to];

  if (p === 'p' || p === 'P') {
    if (uci[0] !== uci[2] && !capture) {
      // en passant
      delete board.pieces[to + (turn ? 8 : -8)];
      capture = turn ? 'p' : 'P';
    }
  }

  if (p === 'k' || p === 'K') {
    // castling
    var frCastle = capture && isBlack(p) === isBlack(capture);
    if (frCastle || squareDist(from, to) > 1) {
      delete board.pieces[from];
      if (frCastle) delete board.pieces[to];
      if (to < from) {
        if (!frCastle) delete board.pieces[turn ? square('a8') : square('a1')];
        to = turn ? square('c8') : square('c1');
        board.pieces[to + 1] = turn ? 'r' : 'R';
      }
      else {
        if (!frCastle) delete board.pieces[turn ? square('h8') : square('h1')];
        to = turn ? square('g8') : square('g1');
        board.pieces[to - 1] = turn ? 'r' : 'R';
      }
      board.pieces[to] = p;
      board[p] = to;
      return;
    }
    board[p] = to;
  }

  if (move[2]) board.pieces[to] = (turn ? move[2] : move[2].toUpperCase()) as Piece;
  else board.pieces[to] = p;
  delete board.pieces[from];

  // atomic explosion
  if (variant === 'atomic' && capture) {
    delete board.pieces[to];
    kingMovesTo(to).forEach(function (o) {
      if (board.pieces[o] !== 'p' && board.pieces[o] !== 'P') delete board.pieces[o];
    });
  }
}

function makeAutoShapesFromUci(uci: Uci, brush: string, modifiers?: any): DrawShape[] {
  const move = decomposeUci(uci);
  return [{
    orig: move[0],
    dest: move[1],
    brush: brush,
    modifiers: modifiers
  }];
}

function san(board: Board, uci: string): string  {
  if (uci.includes('@')) return fixCrazySan(uci);

  var move = decomposeUci(uci);
  var from = square(move[0]);
  var to = square(move[1]);
  var p = board.pieces[from];
  if (!p) return '--';
  var d = board.pieces[to];
  var pt = p.toLowerCase();

  // pawn moves
  if (pt === 'p') {
    let san;
    if (uci[0] === uci[2]) san = move[1];
    else san = uci[0] + 'x' + move[1];
    if (move[2]) san += '=' + move[2].toUpperCase();
    return san;
  }

  // castling
  if (pt == 'k' && ((d && isBlack(p) === isBlack(d)) || squareDist(from, to) > 1)) {
    if (to < from) return 'O-O-O';
    else return 'O-O';
  }

  var san = pt.toUpperCase();

  // disambiguate normal moves
  var candidates: Square[] = [];
  if (pt == 'k') candidates = kingMovesTo(to);
  else if (pt == 'n') candidates = knightMovesTo(to);
  else if (pt == 'r') candidates = slidingMovesTo(to, ROOK_DELTAS, board);
  else if (pt == 'b') candidates = slidingMovesTo(to, BISHOP_DELTAS, board);
  else if (pt == 'q') candidates = slidingMovesTo(to, QUEEN_DELTAS, board);

  let rank = false, file = false, i: number;
  for (i = 0; i < candidates.length; i++) {
    if (candidates[i] === from || board.pieces[candidates[i]] !== p) continue;
    if ((from >> 3) === (candidates[i] >> 3)) file = true;
    if ((from & 7) === (candidates[i] & 7)) rank = true;
    else file = true;
  }
  if (file) san += uci[0];
  if (rank) san += uci[1];

  // target
  if (d) san += 'x';
  san += move[1];
  return san;
}

  return function() {

    if (vm.mode === 'view') return;
    if (!pathOps.contains(vm.path, vm.initialPath)) return;

    var playedByColor = vm.node.ply % 2 === 1 ? 'white' : 'black';
    if (playedByColor !== puzzle.color) return;

    var nodes = vm.nodeList.slice(pathOps.size(vm.initialPath) + 1).map(function(node) {
      return {
        uci: node.uci,
        castle: node.san.startsWith('O-O')
      };
    });

    var progress = puzzle.lines;
    for (var i in nodes) {
      if (progress[nodes[i].uci]) progress = progress[nodes[i].uci];
      else if (nodes[i].castle) progress = progress[altCastles[nodes[i].uci]] || 'fail';
      else progress = 'fail';
      if (typeof progress === 'string') break;
    }
    if (typeof progress === 'string') {
      vm.node.puzzle = progress;
      return progress;
    }

    var nextKey = Object.keys(progress)[0]
      if (progress[nextKey] === 'win') {
        vm.node.puzzle = 'win';
        return 'win';
      }

      // from here we have a next move

      vm.node.puzzle = 'good';

    var opponentUci = decomposeUci(nextKey);
    var promotion = opponentUci[2] ? sanToRole[opponentUci[2].toUpperCase()] : null;

    var move: any = {
      orig: opponentUci[0],
      dest: opponentUci[1],
      fen: vm.node.fen,
      path: vm.path
    };
    if (promotion) move.promotion = promotion;

    return move;
  };

export function makeShapesFromUci(color: Color, uci: Uci, brush: string, modifiers?: any): DrawShape[] {
  const move = decomposeUci(uci);
  if (uci[1] === '@') return [
    {
      orig: move[1],
      brush
    },
    pieceDrop(move[1] as cg.Key, sanToRole[uci[0].toUpperCase()], color)
  ];
  const shapes: DrawShape[] = [{
    orig: move[0],
    dest: move[1],
    brush,
    modifiers
  }];
  if (move[2]) shapes.push(pieceDrop(move[1]!, move[2] as cg.Role, color));
  return shapes;
}

 function playUci(uci) {
   var move = decomposeUci(uci);
   if (!move[2]) sendMove(move[0], move[1])
   else sendMove(move[0], move[1], sanToRole[move[2].toUpperCase()]);
 };