51.4.1 Variation in tempo

During the auction period, after an opponent has acted quickly, it is proper to adjust the tempo back to normal by either delaying one's own call (place the bidding card faced, in front of, but not on the tray) or by waiting before passing the tray.

151.4.2 Drawing attention to a variation in tempo

During the auction, when playing with screens, a breach of tempo may be identified by the slowness or speed with which the tray is returned. It is not considered that a delay of some 15 seconds is necessarily sufficient to convey unauthorised information

The players who receive the tray are the ones who normally draw attention to any abnormality. Consequently it is likely to be an infraction if a player on the side of the screen where the breach occurred is the first to draw attention to it and the player may forfeit for his side its non-offending status..

151.4.3 "Hot seat" actions

In the case of a player confronted with a wholly unanticipated situation or a high level pre-empt a hesitation may be found not to suggest one action over another if the extra time taken may be occasioned by the need of the player to consider what options he has, added to any time he may then take in choosing among them.

151.4.4 Skip bid warnings

These are not used with screens.