In the first case the revoke is not established because neither West nor his partner have played to the next trick. The revoke is corrected. The non-offending side may change any card they played after it, and if
they do then the revoker's partner may change his card if it is after a changed card.
Furthermore, if the revoker was a defender the card that he originally played and was corrected becomes a major penalty card, which must be played at the first opportunity [and there are other options if East gets on lead!].
In the second case since West has played to the next trick the revoke is established. So it stands as played but there is a penalty at the end of the hand. Assuming as seems likely from what you wrote that West won the trick [it seems the revoke was a ruff] then two tricks are transferred at the end of the hand. There are quite a few people here who post sensible answers to questions. By locking this thread you have made sure that only Ed or I can reply. I was curious why - was this an accident or is there a reason? * The person asking the question sometimes accidentally locks the thread when posting - the box says "admin only" but it still happens. This will be disabled in a future release. * [Edited By BbBridgeaddict at 22:51:28 Tue Sep 10 2002]