CLAIMING OR CONCESSION OF TRICKS (law 68)
When you claim the remaining tricks and show your cards to all players, play has finished. If you do not show them to your partner and that partner immediately objects, play will continue.
When claiming, you should at once make a clear statement as to the order in which cards will be played, or the line of play or defence through which you propose to win the tricks claimed.
After the claim, if it is doubted by any player, including dummy, the Director must be called immediately. Opponents should not reveal their cards at this stage.
The Director rules as fairly as possible and will ask declarer how play will be carried out. If there are remaining trumps, trick/tricks will be given to the opponents if no statement was made about how the remaining trumps would be dealt with.
Play should continue, but the declarer cannot draw trumps if this was not stated at the beginning and cannot take a finesse unless the opponent has shown out.
The director will consider from both sides how the play will continue based on what would be accepted as normal lines of play. If all players have already shown their cards, the director may ask for the cards to put on the table and direct play him or herself.
The rules have become more lenient towards those who concede tricks too easily and if within 30 minutes of the scoring, one of the parties claims that a player conceded a trick that he has in fact won or conceded a trick that could not be lost, this can be challenged again and the board is rescored