EmperorsBridgeNotes/LaterBids

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4th suit forcing
The bid of the fourth suit at 2-level is forcing for one round. Responder uses it where they lack a natural bid, but think the partnership should go higher. It forces for one round, and opener bids (in preference order):

raise responder's first suit with 3+support
NT with a stop in the fourth suit
raise the 4th suit with 4 cards in it
make the most natural rebid

After the transfer
e.g. after 1NT-1D-1H:

pass - weak hand
2NT - invitational to part-score or game in H or NT
3H - promises 6 hearts, invitational to game
new suit - promises 5-4 or 5-5, game-forcing
3NT - option to move to 4H or stay in 3NT
4H - promises 6 hearts, to play

After a 1NT-2S transfer

opener bids 2NT if minimum:
- pass or bid a minor suit
opener bids 3C if maximum:
- pass, bid 3D, or 3NT