Editing User:Brian/Bridge/Subsequent bidding after major suit agreement

==Raises to 2M==
After a major suit has been bid at the 1 level and raised to the 2 level (showing 3+ card trump support with 6&ndash;10 points), subsequent bids have the following meanings:
* Pass is to play (showing a minimum).
* A suit below 3M may show interest in either game ''or'' slam.
:* With invitational strength (game interest), it shows a weak 3+ card side suit and asks partner to raise to 4M with either a maximum or less than 2 losers in the bid suit.
:* With slam interest, the help-suit bid is an artificial relay, and asker will bid again after the 3M or 4M response. Asker's rebid is a [[User:Brian/Bridge/Control bidding|control bid]] or [[User:Brian/Bridge/Blackwood|Blackwood]] (see also [[User:Brian/Bridge/Responding to Blackwood|responses]])
* 2NT shows invitational strength with balanced distribution, asking partner to choose between 2NT (pass), 3M, 3NT, or 4M.
* 3M is invitational to game, showing 16 to 18 declarer points and asking responder to raise to 4M with 9+ support points.
* A suit above 3M but below 4M is a [[User:Brian/Bridge/Splinter|splinter]]. Any subsequent bid outside the agreed major is a [[User:Brian/Bridge/Control bidding|control bid]] or [[User:Brian/Bridge/Blackwood|Blackwood]] (see also [[User:Brian/Bridge/Responding to Blackwood|responses]]).
* 3NT shows balanced distribution and game-forcing strength, and asks partner to choose between 3NT (pass) or 4M.
* 4M is a sign-off.
* 4NT is [[User:Brian/Bridge/Blackwood|Blackwood]] (see also [[User:Brian/Bridge/Responding to Blackwood|responses]]).

==Raises to 3M==
Invitational raises to 3M occur in the following types of sequences:
* 1&hearts; (P) 3&hearts;
* 1&clubs; (P) 1&spades; (P) 3&spades;
* 1&diams; (P) 1&hearts; (P) 1&spades; (P) 3&spades;
* (1&spades;) 2&hearts; (P) 3&hearts;
* (1NT) 2&spades;* (P) 3&spades;

Note that a raise of a weak 2M opening or a weak jump overcall is NOT invitational.

After hearing a 3M invitational raise from partner, subsequent bids are as follows:
* Pass is to play (showing a minimum).
* 4M is to play (showing a non-minimum but lacking slam interest).
* A bid in a side suit is a [[User:Brian/Bridge/Control bidding|control bid]], showing slam interest.
* 4NT is [[User:Brian/Bridge/Blackwood|Blackwood]] (see also [[User:Brian/Bridge/Responding to Blackwood|responses]]).

==Conventional raises following interference==
The sequences
* 1M (X) 2NT*
* 1M (1NT) 2NT*
* 1&hearts; (1&spades;) 2&spades;
* 1&spades; (2&hearts;) 3&hearts;
* 1M (2m) 3m
show invitational or greater strength, and at least 3-card support for opener's major. Opener rebids 3M with a minimum, or 4M with a non-minimum. Responder can raise 3M to 4M with game-forcing strength.