Hello is a bridgeconvention used for intervention over an opponent's 1NT opening. It allows for all one- and two-suited hands to be shown, and - for one suited hands - retains the ability to transfer.
History
The name of the convention is derived from the names two of its inventors, Jerry Helms and Bill Lohmann. Jerry Helms had previously co-developed "Helms", similar to the Cappelletti convention and saw this as an improvement to that convention. Helms considered that using 2♣ to show a major used up no bidding space and therefore lost the preemptive value typically attached to bidding major suits.
Description
It features the following calls:
Double is for penalty
2♣ shows diamonds or a major-minor two suiter. Responder transfers to 2♦ which is either passed or advanced (diamond suit) or a major is bid (2 suiter, unspecified minor)