Other 2/1 Features
Use of the 2/1 system usually implies (at least) the following additional agreements:
- Five card majors, i.e. major suit openings require at least a five-card suit;
- Limit raises of major suit openings, i.e. the jump raise 1♠ – 3♠ or 1♥ – 3♥ shows a game-invitational hand with at least four-card support (unless Bergen raises are used);
- Inverted minor raises, in which a jump raise of a minor suit opening is a weak preemptive bid, while a single raise is strong and forcing for one round;
- Jacoby transfers over 1NT opening;
- Jacoby 2NT, showing strong support with 4 or more cards;
- Splinter bids;
- New minor forcing;
- Fourth suit forcing and artificial.
Some also utilize Bergen raises.
Read more about this topic: 2/1 Game Forcing
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