Conventions and guides, chapter
Responder's first bid

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Code	Subject	B	1	2	3	4
214T	Bergen Raises			★
21BA	Responder's 1st bid on a 1 majors opening		★
21BB	Support bid levels : Replies on an opening of 1 in a Major	★	★
21BF	Response to a minor opening	★		★
21BH	Responder with ♦ and a 4 card Major			★
21BJ						★
21BL	Responses to 1 suit opening bid, with no fit fit	★
21BM					★
21DD	Responder's support bid.	★	★
21DF	Major suit support with a balanced weak hand				★
21DK	Inverted minor raises			★
21DP	2 NT fitted (Sayc)		★	★
21FA	Responder's change of suit	★		★
21FH	Weak Jump shifs			★
21FK	Responder's jump shift to 2♥			★
21KA	1, 2 or 3NT responses without a fit	★	★
21LA	The Responder's 1st bid after a 1NT opening	★	★	★	★
21LJ	Gerber convention			★
21MA	The Stayman	★
21MC	Using Stayman with a 5 card Major				★
21MH	Jacoby transfer	★
21ML	Minor suit Jacoby transfer			★
21MN	Texas and 2-suiters			★
21OA	Responding to a pre-empt	★
21OB	Responses after a 2 weak Major opening bid		★	★
21OG	2NT in response to a weak 2 opening (major)			★
21OJ	Response to a level 3 preemptive opening bid.		★
21OK	Response to a major preemptive bid				★
21ON	Responding to a opening 3NT Gambling			★
21OP	Responding to a level 3 preemptive bid (♣ or ♦)				★
21OQ	Responding to a Game level preempt opening bid		★
21OR	Responses to a 4NT preempt opening bid			★
21OS	A bluff bid on a pre-empt at the 3 level				★
21QC	Responses to 2NT	★	★		★
21QE	The responder after a 2NT opening, with a 4 card major.	★
21QF	Bids on 2♣ Openings		★
21SA	Responding bid in 3rd seat after an initial pass		★	★
21SC	Responder's jump fit			★