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if(legalMoves != null) {
 var origen = legalmoves[0][0];
 for(var i=legalmoves.length-1; i>0; i--) if(origen != legalmoves[i][0]) break;
 if(i > 0) movePiece(origen); // fake a click on the only piece that can legally move
}

I got the following code to call the function, though the function didn't work right.

if (typeof legalMoves != 'undefined') {
    var ori = legalMoves[0][0];
    for (var i=1; i < legalMoves.length; i++) {
        if (ori != legalMoves[i][0]) {
            ori = "";
            break;
        }
    }
    if (ori != "") {
        movePiece(ori); // fake a click on the only piece that can legally move
    }
}

But it occurred to me that if it did work right, it would remove the display of the last move. So, I'm not sure I should bother trying to get it to work.