else
should_be_checked = solution.indexOf(piece_no) >= 0
console.log("check " + $("input[type=checkbox]", qpiece).attr("id") + " -> " + should_be_checked)
else
should_be_checked = solution.indexOf(piece_no) >= 0
console.log("check " + $("input[type=checkbox]", qpiece).attr("id") + " -> " + should_be_checked)