In GCBA games in Gloucestershire, we have always allowed UNDOs but there was some controversy about UNDOs this week; in the spirit of "we play this game for enjoyment" we have issued this guidance to our players The default is that they are allowed but in a head-to-head match, if both captain agree, they can be switched off. You can cut the need for UNDO by using the setting to ask for confirmation of each bid or play, but some people do find that tiresome. If UNDOs are on, please only ask if you really did mis-click; you cannot ask for an undo because you played or bid too quickly and didn’t notice what the last player had done. If someone asks for an UNDO, please trust them and accept.