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    // only allow white pieces to be dragged
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  }

  function onDrop(source, target) {
    // see if the move is legal
    var move = game.move({
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      to: target,
      promotion: "q" // always promote to a queen for example simplicity
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    // illegal move
    if (move === null) return "snapback";

    // update the board position
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    // get a random move from the engine
    window.setTimeout(makeRandomMove, 250);
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    // game over
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    var randomIndex = Math.floor(Math.random() * possibleMoves.length);
    game.move(possibleMoves[randomIndex]);
    board.position(game.fen());
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