Bergen Raises Over One-of-a-Major Doubled (BROMAD)
Some partnerships play an extension of Bergen Raises after opener's bid has been doubled. This is called "BROMAD". There are several schemes, including one which keeps 3♣ and 3♦ (as above) and adds 2♣ and 2♦ with similar meanings, but with only 3 card trump support. Others simply have one raise at each level for 7-10 HCP (with 3 or 4 trumps), and use Jordan 2NT with 4 trumps and 11+ HCP. Bergen himself indicates that different partnerships have different preferences for which suit to use. In all cases, the direct raise shows a 'pre-emptive' 3 card raise, limited to 6 HCP.
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