Bidding Over One Club - BOOC
Probably the single most used card in the bidding box is the 1 call. (And for sure the least used is the 7NT card.) Below is the treatment we use when the opponents open with that bid...
The Michaels Cue Bid
The Michaels agreement is very popular, but it always promise at least 5-5 in the two suits. sometimes you will hold a hand with 4-4 or 4-5 in your two suits and not enough strength to push the bidding to the second level. We can handle that problem with the BOOC bids.
Overcall with One Diamond
This is an artificial bid and must be alerted... The description is that it shows both majors, but not necessarily 5-5 in the two suits.
Any of these four hands would qualify:
Hmmm... okay, but what if you actually have a diamond suit, or maybe a diamond suit with one of the majors?
Although the double is a transfer to diamonds, showing at least a 5-card suit, the doubler may also have a 4-card or 5-card major. Here are a couple of typical hands:
One More... 16-18 Notrump
The immediate overcall of 1NT shows 11-15 points, although I would recommend 13-15 if you are vulnerable. If you use the BOOC double, and then rebid 1NT, you should have a better hand - 16-18 points.