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Conventions and guides, chapter
Responder's first bid

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Code Subject B 1 2 3 4
214T Bergen Raises   ★  
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 After an opening of 1 Club or 1 Diamond, the responder jumps in the other minor     ★
21BL Responses to 1 suit opening bid, with no fit fit ★    
21BM Inverted support to the opening minor    ★ 
21DD Responder's support bid. ★★   
21DF Major suit support with a balanced weak hand    ★ 
21DK Support for the opening minor  ★★  
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    ★ 
21QB The responder after a 2NT opening, with a 4 card major. ★    
21QC Responses to 2NT ★★   
21QE Bids on 2NT openings     ★
21QF Bids on 2♣ Openings  ★   
21SA Responding bid in 3rd seat after an initial pass  ★★  
21SC Responder's jump fit   ★