Js Code:
I added a .on("click",...) to a certain Element.
$("#sq" + nextPossibleIndices[i]).on("click", function () {...});
Then i remove it using .unbind('click').
$("#sq" + nextPossibleIndices[i]).unbind('click');
So adding it and then deleting it works fine, but after deleting it once it cannot be added again to that specific html element.