During the auction period, each player may request a review of all previous calls when it is the player`s turn to call.
After the end of the auction period, the defender on declarer`s left would make the opening lead in a face down fashion. Then before the opening lead is faced onto the table, the leader`s partner and the declarer each may request a review of the auction or request an explanation of an opponent`s call.
Furthermore, the declarer or either defender may, at their first turn to play a card, request a review of the auction. This review may be exercised only at the first turn to play for a player. However, the declarer and the defenders may request call explanations throughout the play period at the player`s own turn to play.