var setup1 = ChessBoard.fenToObj('rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR');
var onDrop = function(source, target, piece, newPos, oldPos, orientation) {

$.each( setup1, function( key, value ) {
if (target == key && piece !== value) {
console.log("wrong");
return 'snapback';
}

});