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Competing at the 2-level

Competition at 1 (*) share properties of the following auctions:

  • (*), as opener shows no suit yet
  • 1NT (*), as opener shows only strength

1 (1NT)

I recommend a transfer system below 3NT. Since X frees up 2NT, 2NT and above become transfers (cf. Rubens advances). Below 2NT, continuations to 1NT form a major-oriented structure. Such structure allows bidding a 5-card major regardless of strength.

1 (1NT)-
XPEN, nearly BAL INV+
2!STAY. Garbage STAY. INV 5=
2!TRF, 5+
2!TRF, 5+
2!Minor suit Multi/STAY, 6+ or FG 4+ 4+
2NT!TRF, PRE 7+ or FG 6+
3!TRF, PRE 7+ or FG 6+
3!TRF, PRE 7+ or FG 6+
3!TRF, PRE 7+ or FG 6+
3!Gambling, SOL 7+ suit with no stopper outside
3NT!Gambling, SOL 7+ suit with one stopper outside

1 (2)

Deem this situation as 1NT (2).

1 (2)

Rubinsohl covers these auctions. FunBridge also inspires the Strawberry adjunct over 1m (2M):

1 (2M)-
3!FG, 5=OM
3-3!Ask for stopper
3!FG, 6+OM
The screenshot from FunBridge game engine specifications (requires login)