You should announce your partner’s bid in the following three specific cases:
If partner opens a non-forcing 1C or 1D that can be made with 0, 1, 2 or 3 cards in the suit, you say ‘could be 0, 1, 2 or 3 cards' as appropriate.
If partner opens 1NT - you state the range e.g. ‘15-17’ or whatever the range is.
If you open 1NT and the next player passes and your partner makes a transfer response of 2D or 2H - you say ‘Transfer to Hearts’ or ‘Transfer to Spades’ as appropriate.
The announcement is solely for the benefit of the opponents and partner is not permitted to use any unauthorised information gained from hearing the announcement.
A forcing 1C opening bid needs to be alerted.
No Alert or Announcement is required for a 5-card Major suit opening bid.
No Alert or Announcement is required for a Strong Acol 2 Club opening bid.
No Alert or Announcement is required for a Stayman 2 Club response to a 1NT opening bid.
You should not Alert any call above the level of 3NT that occurs on or after the opener’s rebid. Instead the declaring side alert such calls after the final pass but before the opening lead has been selected while the defending side alert such calls after the opening lead has been selected but before it has been faced.
For the purposes of determining whether a double should be alerted or not, any double on the first or second round of bidding of a one or two level natural suit bid is deemed to be a TAKE OUT DOUBLE. All other doubles are deemed to bePENALTY DOUBLES. Any VARIATIONS must be ALERTED.