1maj - 1NT
Well, this is really not a convention, but a principe we often use. 1NT is not round forcing as in 2/1 system, but we like to bid on even with 5332 distribution. Expectably after 1-1NT, the responder have seldom a balanced hand, and then you will gain in the long run to bid more. 

1 - 1NT: Always bid 2 with 5332 and 3 card Clubs. With 3532 (2 Clubs) you may decide to pass.
1 - 1NT: Always bid lowest 3 card minor with 5332. But if 1NT bidder has opened with pass, you may decide to pass. 


1 - 1NT 
2 : Either (17)18+HCP 4441 with short suit in minor OR 5 Spades - 6+Hearts and a good hand.
        - 2NT: Rele, ber makker vise handen
                - 3: 4414
                - 3: 4441
                - 3: 6-5 in major. May be passed or corrected to spades with minimum.
                - 3: 6-5 in major. GF.
                - 3NT: 7-5 in major. GF.
        - 3: (6)7 Club. Minimum.
                - As after 2NT but 3NT shows 4441 and is to play.
        - 3: (6)7 Diamond. Minimum.
                - As after 2NT but 3NT shows 4414 and is to play.
2NT: Game forcing. Ask responder to show his hand.
        - 3 : 5+Clubs. 
        - 3 : 5+Diamonds
        - 3 : 3 Cards Heart.
        - 3 : 4-4 in the minors. 2 Hearts.
        - 3NT: 5-5 in the minor suits.

1 - 1NT 
2NT  Game forcing. Ask responder to show his hand.
        - 3 : 5 card in a minor.
                - 3 : Relay  (3: 5 Clubs, 3: 5 Diamonds, 3NT: 5-5 in the minors)
        - 3 : 4 cards heart.
        - 3 : 5+Hearts.
        - 3 : 3 card spades. 3334/3343.
        - 3NT: 4-4 in minors.
 


1maj - 2x
2 over 1 shows 10+HCP and is forcing to 2NT. NOT 2/1 style.

1maj - 2x
2maj : 11-14 HCP. Don't promise extra length..
2NT : 13-14 HCP. Balanced hand.
3x : GF, Except after 1 - 2, were 3 shows 11-13 HCP and invitational. .

Drury etter pass
We use Drury, also known as "Toronto", after the responder has opened with Pass.  2 from responder ask opener to show his hand. Responder don't promise support in opening suit. f

· 2 : Minimum opening. 10-12 HCP.
· 2 in opening suit: Normal opening strength. 13-15. 
· Pass - 1 - 2 - 2: 13+HCP. 4+Heart.
· 2NT : 14-15 HCP. Balanced hand.
· Reverse/Jump in new suit: 16+HCP. Natural and GF.
· 3 in opening suit: 6+kort. GF. May be interested in other contracts than in opening suit.
· 4 in opening suit: A long good suit. To play.


Romex trialbid:

Are used after 1maj-2maj to show an invitational hand. With long suit trialbid you bid a suit with many losers, while short suit trialbid shows a suit you are short in. With this excellent convention you can use bothe trialbids!! 
NB! In standard Norway you use long trialbid. 

1 - 2
2NT : Long suit trialbid in Spade.
3/3 : Long suit trialbid in the bid suit..
3 : Pre-empt.
2 : Starts Short suit trialbid. Ask pd to bid 2NT.

1 - 2
2 - 2N 
3/3 : Short suit trialbid in the bid suit.
3 : Short suit trialbid in Spade.

1 - 2
3/3/3 : Long suit trialbid in the bid suit.
3 : Pre-empt.
2N : Starts Short suit trialbid. Ask pd to bid3.

1 - 2
2N - 3 
3/3 : Short suit trialbid in the bid suit.
3 : Short suit trialbid in Club. 


2NT Stenberg

After 3 in a suit below the openingsuit, 3 in the opening major suit from the responder asks for any single. The opener bids his short suit or 3N to deny.