SECOND BID FROM RESPONDER AFTER 1NT Opener Responder in a free auction (no interference) 1/1    1/1   1nt           ? After 1nt Opener's second bid in 1nt limits his hand in a range of 12-15 hcp, and the possible distribution are:  4333  4432  5431 (also 5422), so now Responder must show his strength between: 1- biding sign-off having 5-9 hcp; 2- make a invitation with 10-11 hcp; 3- start a Game Force (GF) with 12+ hcp. =================================== 1- sequences of sign-off: 1.1. The rebid of Responder suit is 100% sign-off and could be done with 5-9 hcp. Opener Responder  Opener Responder    1/1     1             1/1    1    1nt          2              1nt        2   pass                          pass 1.2. A second bid in a less hierarquical suit could be not NMF or a search for support but just a sign-off Opener Responder  Opener Responder       1/1   1               1        1                            1nt       2*             1nt        2 (5+ cards-not NMF)    pass                         pass * If Responder was interested in game he should bid new minor forcing (NMF) so 2 could be bided with 5-9 hcp and Opener must choise in pass or correct to 2 and with 3-2 in major Opener can pass if don't has honor in Spades - there is a chance that Responder have also 5 cards. Note1: In the sequence 1 - 1 - 1nt - 2 is NMF but 2 is sign-off showing 5+ cards, so here Opener has no preference for Spades unless Opener has singleton in Diamonds.   1.3. simple raise in Opener suit shows a sign-off and shows 5-9 hcp in Responder's hand. Opener Responder Opener Responder      1       1             1          1    1nt       2             1nt         2   pass                    pass   Opener Responder Opener Responder      1        1            1          1   1nt         2            1nt         2  pass                        pass =================================== 2- Invitations sequences: 2.1. When Responders's rebid in jump to level 3 shows a 6th suit with 10-11 hcp and ask for support or pass from Opener. So Opener pass with minimum or only 2 blank cards. Opener bid of 3nt could be a disaster if has only 2 cards and minimum. Opener with good 13 hcp or 14 hcp and 3 cards or honor second must bid game. Opener Responder Opener Responder    1/1   1             1/1    1   1nt        3               1nt        3      ?                             ? Now is the Opener that decide if goes to game or pass: 2.1.1 pass with singleton always 2.1.2 pass with dubleton and minimum 12-13 hcp 2.1.3 bid 3nt with honor second and 14/15 hcp 2.1.4 support Responder's suit with 3 cards and 13-14 hcp. Note2: in this avaliation it is important A or K to decide for game, hands with many Queens and Jack is danger for bid game with 23-24 hcp. 2.2. The jump in level 3 in a less hierarquical suit shows 5-5 hand with 10-11 hcp in 2/1 system but is GF in SAYC, so to be GF Opener  Resp   Opener Resp   Opener Resp   1/1   1       1       1        1       1    1nt       3       1nt       3        1ST      3      ?                      ?                       ?  Opener Resp or Opener Resp      1        1          1        1  1ST       3          1ST       3    ?                         ? Now Opener decide if goes to game or pass or sign-off in first suit: 2.2.1 pass with 3 cards and minimum 12/13 hcp - bad support 2.2.2 simple preference with minimum and bad support 2.2.3 bid game in level 4 or game in level 5 with honors good support 2.3.4 support minor in level 4 is invitation 2.3.5 bid 3nt with maximum 14/15 in hand 5422 and honors in Responder suits. 2.3 jump at level 3 in Opener suit shows 10-11 hcp with 4+ cards Opener Responder      Opener Responder     1      1                     1        1   1nt      3 invitation     1nt        3 <= 10-11 hcp     ?                                    ?   Opener Responder      Opener Responder    1      1                     1        1   1nt      2 invitation     1nt       3 <= 10-11 hcp     ?                                ? 2.4 raise to 2nt showing 11 hcp Opener Responder      Opener Responder    1/1   1                    1/1   1  1nt      2nt invitation     1nt      2nt invitation 11 hcp    ?        with 11 hcp        ?  =================================== 3- Sequences that can be FG / Slam: 3.1 The New Minor Forcing (NMF) need 10+ hcp and the major can be 5th or 6th asking for 3 cards support. It is fundamental read NMF. Opener Responder     Opener Responder      1      1                    1         1  1nt      2 => NMF      1nt        2 => NMF    ?                                 ?   Opener Responder    Opener Responder      1        1                 1         1  1nt        2 => NMF   1nt        2 => NMF   ?                                ? 3.2 The Responder's second bid in reverse is GF: Opener Responder or Opener Responder      1       1                    1         1  1nt       2 => GF         1nt        2 => GF    ?                                  ?   3.3 The raise to Opener minor at level 4 ask to Openr cuebid and shows strong support and Slam interesting: Opener Responder  Opener Responder      1        1                 1         1  1nt        4 => GF      1nt        4 => GF    ?                                 ?   Opener Responder  Opener Responder      1        1                   1        1  1nt        4 => GF         1nt        4 => GF    ?                                  ?   Note3: If the Opener's second bid at level 1 is other suit then the 4th suit bid by Responder is FG, include 1 after 1 pass 1 pass 1 now the 1 not shows 4 cards but ask for stopper in Spades or support in Diamonds so Opener whitout stopper or support must rebid his Clubs suit.  Thus, Responder to show 4 cards in Spades need bid 2 that's also a GF! Opener Responder      Opener Responder      1        1                     1        1   1        1 => GF          1        2 => reverse 5-4-x-x    ?                4th suit       ? / / /