The opponent's have made a takeout double of your partner's opening bid. This is not a problem. The opponent's have provided you with an opportunity. First, you have a new bid available: the redouble.
Traditional bidding uses the redouble to mean: 10+ HCP and probably no fit with the opening …
2NT shows a 4-card support raise with a wide range of HCP
Not a preemptive raise (<6 HCP), we use the double raise to the 3-level to show very weak hands, but with good trump support. This supports the idea that the law of total trump (9) should play best …
One of the weaknesses (flaws) of the 2/1 bidding system is the Forcing NT bid. This bid is a very wide range (5-11 HCP), may or may not deny support for the opener's suit, and often forces the opener into a vague rebid that doesn't contribute to describing their …
Opening 2
is very strong
We have re-tasked the opening 2
to show a balanced 18-19 HCP hand. A strong hand, but not a powerhouse.
This results in our redefining an opening 2♦ from a weak 2 bid to now be our bid with a hand too strong
to open …
The opponents will interfere after our 1NT opening as often as possible. Even more likely in tournament competitive play. Most interference bids are designed around bidding a long (6 card) suit or a shapely (2-suit hand). They are consuming our communication space. We want to be able to communicate invitational …