This convention was made by Bjorn Olav Ekren, Norway, and has become very popular here in Norway. The Ekrens 2 opening promises at least 4-4 in the major suits and 3-10 HCP. Ekrens is basically a preempt convention, but it should be used with care if you don't meet with these restrictions:
You should have your HCPs concentrated mostly in the major suits, you should have maximum 5-5, and with 4-4 you should not have an invitational hand against 1NT opening. (These restrictions are my personal opinion based on experience.)
Responses to 2:
Rebids after 2 - 2NT:
Responses after 2 - 2NT - 3:
Rebids after 2 - 2NT - 3 - 3:
Note:
2 | Pass | 2NT* | Pass |
3** | Pass | 3/*** |
* Relay, ** 5-5, *** slam invitational