HOW RESPONDER COMPETE         
 
 After an opening in first or second position if opponent interfere there some standards bids in 2/1 system where Responder may inform his hand to Opener and here we will discuss some of these Responder’s bids:
 
 PART 1/3 – RESPONDER HAVING LESS THAN 10 HCP
 
 1- Suppose Responder has:
xx xx AQJ10xx J10x and bidding goes:
 a) Opener Overcaller Responder
        1
         1            3 <= less than 10 hcp and good 6 cards
 
 b) Opener Overcaller Responder
        1
         2            3 <= less than 10 hcp and good 6 cards
 
 c) Opener Overcaller Responder
        1
        double     2 <= no redouble, less than 10 hcp, transfer to 2
the transfer allow the more strong hand receive the lead and Responder may also inform his partner that he has support!

 d) Opener Overcaller Responder
        1
        double     2 <= no redouble, less than 10 hcp, transfer to 2
 
 e) Opener Overcaller Responder
        1
         2           double <= 4+4+ or 7-9 hcp and long minor suit
after partner opening and a overcall occurs the double is to inform Opener that Responder has the other two suits and this do not define the Responder strength but shows not a hand up to 10 hcp. But if Responder bids again he is bidding a long suit and his hand is weak.
         ?
       2NT       pass         3
<= sign-off
        3
        pass         3 <= sign-off
        3
        pass         pass
        3
        3            4 <= sign-off     
        3
        pass         pass
 
 f)  Opener Overcaller Responder
       1
         2            double <= 4+4+ or 7-9 hcp and long minor suit
         ?
       2
        pass          3 <= sign-off
      2nt        pass          3
<= sign-off
       3
        pass          3 <= sign-off
       3
        pass          pass
       3
        3              4 <= sign-off
 --------------------------------------------------------------------------------
 
 2- Suppose Responder has:
xx AQJ10xx x J10x and bidding goes: 
 g) Opener Opponent Responder Overcaller
      1
         pass         1NT             2
      pass      pass         3
<= invitation to 4 shows 6/7 cards and 9/11 hcp
Why Responder didn’t bid 2? Because in 2/1, 2 after 1 opening need 12+ hcp
 
 h) Opener Overcaller Responder Opponent
      1
          2/2      double*      3/3 <= support
     pass        pass         3
<= sign-off       * means less than 10 hcp
 
 i) Opener Overcaller Responder Opponent
      1
          2/2      double        pass
     pass        pass         3
<= invitation to 4 (if 2 then sign-off)
 ---------------------------------------------------------------------------------
 
 3- Suppose Responder has:
xx KQJxxx x J10xx and bidding goes: 
 j) Opener Opponent Responder Overcaller
      1
         pass         1NT             2
      pass      pass         2
<= sign-off
 
 k) Opener Opponent Responder Overcaller
      1
         pass         1NT             3
      pass      pass         3
<= sign-off
 
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 PART 2/3 – RESPONDER HAVING 10-11 HCP
 
 When Responder has support to Opener's major after the interference the priority is inform partner about invitation hand with 10-11 hcp. Not necessarily bid another suit and after support partner because this may confuse Opener: may seems slam interest or 2 cards support? So cuebid is the appropriate way to inform the invitation.
 

4)  Suppose Responder has: 10xx AQJ10x xx K10x and bidding goes:
 l) Opener Overcaller Responder
        1
         2           3 <= 3 cards support 10-11 hcp
         ?
        3
<= minimum opening 12-13 hcp - Responder should pass
       3NT <= strong opening 18-19 hcp - Responder may pass
        4
<= asking for cuebid - Responder may cuebid 4
        4
<= good opening 14+ hcp - Responder must pass
 
 m) Opener Overcaller Responder
        1
        1              2+ and 10+ hcp one-round force
         ?
       2NT      pass           pass
        3
       pass           pass <= without support game is difficult
        3
       pass           pass <= maybe a misfit hand
        3
       pass           pass <= Opener has minimum hand
        3
       pass            4    <= Opener splinter shows slam interesting
        4
       pass           pass <= Opener has good hand
 
 n) Opener Overcaller Responder
        1
       2             3 or double <= difficult decision but double followed
         ?                                                     by 4
is a good bid to avoid overbid
       2NT     pass          pass
        3
      pass          pass
        3
      pass           3
        3
      pass           4
        4
      pass          pass
 
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 PART 3/3 – RESPONDER HAVING 12+ HCP
 
 When partner opens and opponent interfere making Responder's bid be at level 2 or 3 if Responder double this shows 8-11 hcp but if Responder bids then this must be GF with 12+ hcp. In case Responder double to show 4 cards in the other major and after cuebid this is GF.
 
 5)  Suppose Responder has:
10x AKJ10x xx KQ10x
 and bidding goes:
 o) Opener Overcaller Responder
        1
         3            3+ denies 3 cards
         ?
        3
                 =>   4
       3NT                =>  pass
        4
                 =>   5
        4
                 =>   4
        4
                 =>  pass
 
 p) Opener Overcaller Responder Advancer
        1
        1             2             3
       pass     pass          4
  <= not GF because there are 2 Spades losers
         ?
       pass <= also 2 Spades losers
        4
   <= Qx or xxx with minimum
        5
   <= singleton Spades with minimum 5+ cards and control
 
 6)  Suppose Responder has:
x AKJx Kxx KQ10xx and bidding goes:
After partner opening in a minor if Overcall is in Spades a double by Responder promises 4
cards and may have 5 or 6 if Responder bids Hearts at level 3 as a sign-off bid.
 q) Opener Overcaller Responder Advancer
        1
        2            double       3
       pass     pass          4
  <= GF singleton Spades or Ace/void
         ?
       4NT <= need 2 aces to try Slam
        5
<= only one ace
 
 r) Opener Overcaller Responder Advancer
        1
       1            double       2
        3
     pass          3  <= GF singleton Spades or Ace/void
         ?
        4
      <= need 2 Aces to cuebid so Responder should bid 4NT
                       and using RKC1430 if Opener response is 5
then 6
                       and if response is 5
(no Q) then pass
        4
      <= only one ace minimum so Responder should pass       
 
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