In the game of bridge Ekren refers to a preemptive opening of 2 defined as 4-4, 4-5, 5-4 or 5-5 in the majors and 3-10 hcp. This conventional preempt was designed by Bjørn Olav Ekren from Norway. It can be seen as an example of the modern style of ultra aggressive preemptive bidding.
Responses to a 2 Ekren opening :
In responding to the 2NT relay the opener indicates whether (s)he holds a minimum or a maximum (because of their playing strength 5-5's are generally considered maximum), and - in case of a maximum - the distribution in the majors:
Variants of Ekren include the use of the 2 opening to indicate a weak hand with at least a 4-4 in the majors. This treatment has the advantage that the left hand opponent of the opener can hardly gamble on the fact that (s)he will get a second chance to bid.
Another variant that is popular in the Netherlands (where it is referred to as Tilburg Two) and Belgium is to accommodate the Ekren hands as a weak variant in the strong 2 opening. This leaves untouched the 2// openings which are commonly utilised in the Low countries as Multi 2 diamonds and Muiderberg openings. Also, a 2 relay is now available to responder that can be used to ask for the longest (or better) of the two major suits.