diff --git a/js/pacosako_ui.js b/js/pacosako_ui.js
index 5a221f4..de8169b 100644
--- a/js/pacosako_ui.js
+++ b/js/pacosako_ui.js
@@ -228,6 +228,7 @@ $(function (){
       piece.stop(true);
       piece.attr('id', piece_id);
       piece.removeClass('cb-selected');
+      piece.removeClass('cb-in-check');
       piece.removeAttr('style');
       piece.data({ side: side, type: type, location: where });
       piece.appendTo(cbSquare(where));