 There is no penalty whatsoever for the exposition of declarer's cards, provided it was played inadvertently (a card apparently played advertently may not be retracted except for the purpose of revoke correction).If a card is exposed during the auction (law 24), it may become a penalty card, and offender's partner may be forced to pass to the end of auction.In general, only the defenders are subject to penalties for opening lead or other play out of rotation (law 53-59).