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(Courtesy) Mark London
                       PRECISION BIDDING IN BRIDGE - Extended
               * means not specified in simplified version.
               # means specified in simplified version.
               @ means specified in Goren's version.
               ! means not specified in Goren's version.
         Count distribution points only when supporting partners suit.
                     A = 2 controls, K = 1 control
1. 1C: 16 or more, 15 with 5-5 or 14 with 6-5
      a) NEGATIVE: 1D: 0-7 or (* Impossible negative(4441) 8 pts)
                 1) 1NT: 16-18 balanced
                         Pass: 0-6 balanced
                         2C: 6-7 stayman
                               ! 2D: No major 16-17
                               ! 2NT: No major 18
                         2D/2H/2S: 0-5 unbalanced, signoff
                         Jump to 3 of a suit: Impossible negative,
                                             singleton in suit bid
                  2) 2NT: 19-21 balanced
                       3C: stayman or Impossible negative
                       3H/3S: 5 carder, forcing
                       3NT: sign off
                       4 of a suit: natural, long suit
                       5 of a minor: game, signoff
                  3) 3NT: 24-26 (#25-27)
                 4) Jump in a suit: 22, good 5 carder suit or freak hand with
                       9 winner. With 4441 bid lowest suit.
                        # Treat like strong 2 bid, min NT =  negative response,
                        #   raise shows some values.
                           min NT: 0-3 doubleton support 
                          raise: 0-3, 3 card support
                          New suit: 4-7 min 4 carder (avoid with weak suit)
                          Jump raise: 4-7, 3 carder support
                          Jump new suit: Impossible negative
                          Jump NT: Impossible Negative in opener's suit
                  5) Non Jump in suit bid: 5 carder minor or 4 carder major.
                        With both, bid 4 card major unless very weak.
                          Pass: 0-4, 2 card support
                          Raise: 2-4, 3 card support
                          min NT: 5-7, no 5 carder
                          new suit: 5-7, 5 carder
                          Jump Raise: 5-7 4 card support
                          Jump new suit: Impossible negative
                          Jump NT: Impossible Negative in opener's suit
    * b) CONSTRUCTIVE: 2H/2S: 4-7, 6 carder with 1 top honor
                                  7 carder with J
    * c) CONSTRUCTIVE: 3C/3D/3H/3S: 4-7, 7 carder or J to 8
      After a CONSTRUCTIVE response
               Pass: No chance of game
               Game: sign off
               2NT: suit fitting. asking for singleton
                        Rebid: no singleton
                        New suit: singleton
               New suit: Forcing
                       Raise: 3 card support
                       new suit: 2 card or less, side values in suit bid
                        Rebid: minimum, no 3 card support
                       3NT: maximium, no 3 card support
               Raise: Inviting
                       Pass: minimum
                       Game: maximum
      d) POSITIVE: 1H/1S/2C/2D: 8 points, 5 carder.  With 11 points or more 
                  and at least 4 controls, jump at your next response (unless
                  you have a balanced hand and would go past 3NT).
                Raise: TAB (see below) (#3+ card support min)
                 New suit: 5 card+
                     Responder bids as follows with 8-10 pts or 0-3 controls
                       raise: 3+ card support
                       New suit: 4+ cards, denies support
                       NT: denies support or good need suit
                       rebid suit: 6+ cards, prefer rebidding a major suit
                                   to bidding or raising a minor suit
                    With 11+ pts and 4+ controls responder bids similarly,
                    but with a jump, but not if bid passes 3NT.
                NT response: no 5 card suit (unless weak minor)
                     @ 2C: exactly 8 points, no unbid 4c or longer suit
                       New suit: 4+ cards
                        rebid suit: 6+ cards, prefer rebidding a major suit
                                    to bidding or raising a minor suit
                       NT: Game forcing
                Jump raise: 19-21 good support
                       Game: Signoff
                       New suit: Cue bid
                Jump shift: Solid 6c or longer and 19+.  May use AAB for
                       Raise: min
                       NT: min with some strength in all unbid suits
                       New suit: Cue bid
                3NT: 16-18, no good 5+ card suit or 4c major, balanced
                               New suit: At least 5-5 distribution
                4H/4S: 16, no good 5+ card suit, 3+ card support
      e) POSITIVE: 1NT: 8-10 balanced
                2C: Stayman
                          2D: no major
                          2H/2S: major
                 2D/2H/2S/3C: 5 carder suit
                          Raise: 3 card support
                          Show major or NT
                 2NT: invitational to game
                       Pass: minimum
                       3NT: maximum
                 3NT: sign off, 17-18 pts, balanced
                Jump in a suit: min 19, 6 carder semi solid suit
                4NT: invitational to 6 NT 
                       Pass: minimum
                       6NT: maximum
      f) POSITIVE: 2NT: 11-13 balanced or more than 15
                3C: stayman
                       With greater than 15, respond:
                       4C with 4c C
                       4D with 4c D, no 4c C
                       4H with 4c H, maybe 4c S
                       4S with 4c S, no 4c H
                3D/3H/3S: 5 carder
                3NT: sign off
                4C: Gerber
      g) POSITIVE: 3NT: 14-15 balanced
               4C: modified stayman asking responder to start bidding his 
                  4 carder starting from lowest
    # h) POSITIVE: 2H-3D Impossible negative(4441) 8 pts, singleton in suit bid.
        a) After Double by opponents:
                Pass: 0-7 with 4+ card C
                1D: 0-7 with 3 or less card C
                Redouble: 8 pts, two 4 card majors
               Other calls: natural as without intervention
        b) After an overcall up to 2S:
                Pass: 0-4
                double: 5-8 pts, no 5c suit
                suit bid: 5-8 pts, 5c suit
                jump suit bid: 5-8 pts, 6c+ suit
               min NT: 9+, 5c+ suit, unbalanced
               jump NT: 9-11 balanced, stopper in oppenent's suit
               3NT over a 1 level overcall: 12-14, stopper in oppenent's suit
                Cuebid: 9+ no good 5c suit, no stopper in oppenent's suit
               NOTE: Many play 1NT over a 1 level overcall as normal 8-10 pt
                       balanced and stopper, and use cuebid instead.
        b) After an overcall greater than 2S:
               double: Penalty
               3NT: 9-12, 1 good stopper
               Suit: Good 5c+, probable game
               Cuebid: Strong takeout
      After a POSITIVE suit response, 
      Raise of that suit is TRUMP ASKING BID called TAB.
              No top 3 honors: 1st step, 5+ carder
              1 top honor=2nd step 5 carder
              2 top honor=3rd step, 5 carder
              1 top honor=4th step, 6 carder
              2 top honors=5th step, 6 carder
              3 top honor=6th step, 5+ carder
      Jump shift=19pts, semi solid 6 carder with max 1 top honor missing
      this is ACE ASKING BID (AAB)
              Cheapest NT: No top honor, no side Ace
              single raise: top honor in openers suit, no side Ace
              New Suit: No top honor, Ace is sut bid
              Jump in new suit: Top honor in openers suit, side A in suit bid
              Jump in NT: No top honor, 2 side Aces
              Jump raise: Top honor, 2 side Aces
      Ater opener has applied TAB or AAB, any suit bid is CONTROL ASKING BID
              1st step: 3 or more low cards (No control)
              2nd step: Doubleton or Q (3rd round control)
              3rd step: Singleton or K (2nd round control)
              4th step: void or Ace    (1st round control)
              5th step: AK or AQ       (1st and 2nd round control)
      Opener can then rebid the suit to find out if control is honor or
      ruffing.  (Goren omits this, but it was in original precision and is
      included in other versions.)  The replies are:
              1st step: ruffing
              2nd step: honor
      TAB and CAB after intervening bid by opponents:
              1st step: Double
              2nd step: Pass
              3rd step: next higher bid .......
2. 1D: 11-15, min. 2 carder diamond (@ 4 cards).  With 11 hcp don't bid with
        4333 or 4432 without a major, or if strength only in the short suits.
       a) Pass: 0-7 (although you might bid with a max and long suit)
       b) 1H/1S: 8-15, 4 carder. With both bid H first, with both 5 carder S 1st
               Bid 4 card major even if you have longer minor.
                  Raise with 4 card support
                  bid S 4 carder over H
                  Rebid 6 carder
                  1NT balanced
                  bid 4 or 5 carder C minor
                  Jump raise with 4 card support
                  bid 4c+ good new suit above 2D
                  Jump rebid 6 carder
                  Jump to 3C with 5-5
                  Jump to 2NT
       c) 1NT: 8-10 balanced
       d) 2NT: 16+ balanced (# 11-13 balanced) responses:
                  3C unbalanced min
                       3D asks to show 4c major
                  3D balanced max
                  3NT balanced min
                  new suit unbalanced max
       e) 3NT: 14-15 balance, 4 card major (# 14-16)
       f) 2C: 11, C suit, no 4 card major
             Opener to show point range and stopper in Major suits
                      11-13                      14-15
          NO stopper     2D                         3C
          H stopper      2H                         3H
          S stopper      2S                         3S
          H,S stopper    2NT                       3NT
       g) 2D: * 11-15, 4 card support, no major
                Opener to show point range and stopper in Major suits same
                as above except 3D at 11-13 no stopper
              # 8-10, 4 card support, no major 
       h) Jump in a new suit, 16+ 4 card majo5 carder good suit
                 1) raise: min 3 carder support
                2) 3NT: min balanced, 2 card support
                 3) New suit or 3D: min unbalanced, max doubleton support
                 4) 2NT: maximum balanced
                       3NT: balanced minimum
                       3C: unbalanced minimum
                       3D: balanced maximum
                       new suit: unbalanced max
       i) 3D: * Pre-emptive, 5 card support
              # 11-13, 4+ card support
               Redouble: 11 or more
               Other: natural as without intervention
               Double at 2 level: one 4 card major
               Double at 3 level: for penalties
               Cue Bid: min 11, opener bids good 4c side suit
3. 1H/1S: 11-15 5 carder.  Bid longer minor first unless weak hand.
        Note: Goren specifies that game try bids are help asking bids in
        precision, i.e. looking for support in that suit.  More common is
        game tries showing long suit, although they are very similar.
      a) Pass: 0-7 no game, poor support
      b) Single raise: 8-10, 3 card support
               1) pass with minimum
               2) new suit with max
      c) Jump Raise: 11-13, 3 carder support (# Qxx or better)
      d) Triple Raise: max 10 points, 14-15 with distribution, 4 carder
      e) Double Jump in new suit: 11-15, 4 card suport void or singleton in suit
      f) New suit without jump: 1S over 1H 8-15, 2 level response requires
           11 (less with very good suit). 2H over 1S shows at least 5 cards.
                Opener to show 11-13 or 14-15
             11-13: (#11-14)
                1) raise 3 card support
                 2) rebid 6 carder
                 3) min NT 5332
                4) bid new suit, 4 carder at 2 level
                5) Rebid 5 card suit
                After any of the above, only the following bids by responder
                  are forcing: 
                       1) Jump in new suit
                       2) new suit at 3 level
                       3) new suit after 2/1 response
                       4) Jump raise of opener's suits after 2/1
             14-15: (#good 14 - 15)
                1) Jump Responders major with 3 card suport
                2) Jump in own good 6 carder
                 3) new suit (good, at least KQxx) at 3 level
                4) Jump to 3NT
                5) Raise Responders minor to 3 level with 3 card support
      g) 1NT: 8-15 forcing, no good suit, no support
                1) 11-13: Rebid own suit
                          Bid 2nd lower 4 carder
                          3 carder minor if necessary
                 2) 14-15: Bid 2nd higher suit at 2 level
                          raise to 2NT
                          Bid new good suit at 3 level
                          Jump rebid own 6 carder
      h) 3NT: 14-15 points, good 3 card support (# 14-16, denies 3 card support)
      i) Jump in new suit: 16 with good 5 carder
              1) raise with 3 carder
              2) poor support min NT
              3) show good 4 carder with unbalanced hand
              4) rebid 6 carder
      j) Jump to 2NT: 16 points, 3 card support, no good 5 carder
                   (# 11-13 points, denies 3 card support)
         a) After Double by opponents:
                1) raise to 2,3,4: max 7 pts, preemptive
                2) 1NT: 8-10, min 3 card support
                3) 2NT: 11-13, min 3 card support
                4) Redouble: 11 or more
               5) Other calls: natural as without intervention
         b) After an overcall
               1) Raises=natural as without intervention
                2) 1NT: 8-10, 1 stopper
                3) 2NT: 11-12, 1 stopper
                4) Cuebid: 11 points, good support
               5) Double: holding 2nd 4 carder major
                6) Other calls: natural as without intervention
4. 1NT: 13-15 balanced, may have 5 card minor
       ! Bid 1D with a bad 13-14 and VUL vs. NONVUL or 3rd seat and VUL.
       ! Bid 1D with both majors to make it easier to find a low level 4-4
       ! fit in a major, as if 1NT-2C-2H-2NT, you will be forced to bid 
       ! S at the 3 level.  Also, then the sequence 1NT-2C-2major-3minor can 
       ! be bid as an invite to 3NT with a long minor without a 4 card major,
       ! as opener will not return to the other major thinking you have it.
      a) Pass: 0-9 balanced
      b) 2C: nonforcing stayman 8-11 or weak hand and short in C.
               (#  10-11 or weak with long C, next bid 3C)
              1) 2D: no major
              2) 2H: H major (@ maybe S, see above)
              3) 2S: S major
                     ! A suit rebid by responder now shows at least 5
                     ! cards.  A minor suit rebid usually shows at least 6
                     ! and does not guarantee a 4 card major, invite to 3NT.
      c) 2D: 12 forcing stayman
              1) show 4 card major, H first.
                     ! 2NT asks to show 4+ card minor, or bid 3NT if none
              2) 5 card minor
              3) 2NT
                     ! 3C asks to show shape:
                     !        3D=3343, 3H=2344, 3S=3244, 3NT=3334
      d) 2H/2S/3C/3D: signoff, long suit no game
      e) 3H/3S: 13, 5 carder.
                     ! With 17 and minor suit strength bid 2D first to 
                     ! investigate minor suit slam if opener has 5 card suit
              1) 3NT: max doubleton support
              2) Raise: 3 card support min hand
              3) Cuebid: 3 card support, max hand
      f) 2NT: 10-11 balanced
      g) 3NT: 12-17 balanced
      h) 4NT: 18-19 balanced
      i) 6NT: min 20, balanced
      j) 4C: Gerber Ace asking
      After Double:
               Pass: asks opener to rescue himself
               Redouble: 8 or more (@ 10)
               2 level bid: 0-7 signoff (# 2C = stayman)
      After Overcall:
              Double: penalties
              suit: sign off
              cuebid: Game force Stayman
              3H/3S: 5 card, game force
5. 2C: 11-15 6 cards or very good 5 cards with other 4 card suit (except 
        with singleton/void D in which case bid 2D).
      ! With a bad 6 carder, bid 1NT with 13-15 pts and 3-2-2 and stoppers in 
      ! other suits.  With a bad 6 carder, 3D, and 2-2 in majors, bid 1D.  
      ! Don't bid a bad 6 carder otherwise unless you have < 2D.
       a) Pass: 0-7
       b) 2D: 11 pts, usually looking for 4-4 major fit, can be bid with less
               points with C support and/or strength in the major.
                  2H/2S: side suit 4 or 5 carder
                  2NT: 6 carder C, 2 side suits stopped
                       3D: stoppers in suits
                           3H: H and D stopped
                           3S: S and D stopped
                           3NT: H and S stopped
                  3C: 6 carder C, 1 side suit stopped
                      3D: stopper in suit
                          3H: H stoped
                          3S S stopped
                          3NT: D stopped
                  3D: 6 carder C, 5 carder D
                  3H/3S: side suit
                  3NT: solid 6 carder C, no 4c major
                  4C: Broken 6 carder suit, highly unbal
        c) 2H/2S: 8-10, 5 carder suit, not forcing
                  3C: Signoff
                  raise: invite
                  2NT: invite, poor support
        d) 2NT: 11-12 balanced no major (# 11-13)
                  pass or 3C: minimum
                  3NT or new suit: Maximum
        f) 3C: 8-10 points, 3 card support, no 5 card major, not forcing
                   Pass: 11-13 
                   3NT: 14-15
        g) 3D/3H/3S: 14 pts, 5 carder
                   11-13: Raise with 3 card support or 3NT
                   14-15: Cue bid Ace in the cheapest suit
        h) 3NT: 14-16 balanced
        a) After Double:
               Redouble: 11 pts, penalize later
               Other calls: as without intervention
        b) After overcall at 2 level:
               Double: No penalties, opener to bid major suit if any
              @ 2NT: conventional, in replacement of original 2D relay
                      11-13: 3C
                      14-15: Cuebid in opponents suit, stopper
                             second suit: natural
        c) After overcall at 3 level:
               Double: for penalties
               Other calls: natural
6. 2D: 11-14 4414 4405 3415 or 4315.  Responder should ignore strength in D
       suit (except for A) unless planning to play in NT.  Opener should
       discount singleton K or Q of D when opening with 11-12.
        a) Pass: 0-10, 6 carder diamonds
        b) 2H/2S/3C: 0-7 sign off
        c) 3D; 11-13, semisolid 6 carder D
        d) 3NT: 11-13, solid 6 carder D suit
        e) 3H/3S: 5-7 points, 5 carder suit, no wasted value in D
                Pass: minimum
                4H/4S: maximum, void in D
        f) 2NT: 8 points, opener to define his hand
                     3C: 3-4-1-5
                            3D: opener to define his hand
                                3H: minimum
                                3S: maximum
                      3D: 4-3-1-5
                            3H: opener to define his hand
                                3S: minimum
                                3NT: maximum
                      3H: 11-13, 4-4-1-4
                     3S: 14-15, 4-4-1-4
                     3NT: 14-15, 4-4-1-4 (D=K or A)
                     4C: 11-13 4-4-0-5
                     4D: 14-15 4-4-0-5
        g) game: Signoff
        a) After Major Overcall: 
               X: Penalty.  Openers bids 3NT with 3 cards in suit, else pass
        b) After X showing D:
               XX: negative, 11 pts, game forcing
        c) After D Overcall:
               X: Penalty
               New suit: not forcing
               Cue bid: looking for controls
        d) After X showing values:
               XX: Long D suit
               2H/S: weak hand, 4+ carder
               If responder and RHO passes, opener bids:
                       XX: shows 4414
                       2H: 3415
                       2S: 4315
                       3C: 4405 min
                       3D: 4405 max
        e) After pass through 3C response followed by an overcall,
           opener must pass since partner's strength unknown.
        f) After 2NT Response followed by a Major overcall
               Pass with 3c C
               X with 4c C
        g) After 2NT Response followed by a D overcall
               Pass: 4144
               X: 4405
               Major: shows 4 cards.
7. 2H/2S: 8-10 good 6 carder (# 5-10).  Avoid with a 4c other major.
         a) Pass: no game, no fit
         b) Raise to 3 or 4: sign off
         c) New suit: forcing
               Raise: 3 card support
                    rebid own suit: forcing
         d) 2NT: conventinal
                opener bids suit with singleton or void
                Rebid own suit
8. 2NT:22-23 balanced
        Pass: 0-3 balanced
        3C: 3 pts, stayman
        3D: Jacoby transfer to 3H holding minimum 5 carder
        3H: Jacoby transfer to 3S holding minimum 5 carder
        After transfer is accepted, responder can then bid:
              3NT: opener choses between 3NT and 4H
              Game in major: 6 carder
              new suit: cuebid and slam try
        3NT: signoff, 4 pnts, no major, balanced
        4C: Gerber Ace asking bid
        4NT: Invitational to 6NT, 10 pts, no major
9. 3C/3D/3H/3S: 6-10, little side strength, penalty not more than 500 if dbled
                    Responder is master and bids according to his holding and
                    vulnerability as opener has already declared his winners
10. 3NT: 27-29 balanced
Goren recommends the following for defensive bidding, but it is not an
essential part of Precsion, so any overcall system can be used.
    a) Simple suit Overcall: 11-15 pts, 5 carder, at least KQ
    b) Jump suit overcall: Preemptive like original
    c) 1NT: balanced 16-18 At least 1 stopper
           2C: nonforcing stayman
           2D:/2H/2S: signoff
           2NT/3NT: natural
           Jump in new suit below game: natural and forcing
    d) Double: 13 pts, support in all other suits
              suit: 0-7 pts
              jump suit: 8-10 non forcing
              1NT: 8-10 balanced, 1 stopper
              Pass: solid 5 carder trump with KQJ10 or better asking
                   partner to lead trumps
    f) Cuebid: 14 pts, two suiter 5-5
              if responder does not bid one of the two suits, again cuebid
      a) Double: balanced, same strength as openers NT
      b) 2C: 5-5 minors
      c) 2D: 5-5 majors
      d) 2H/2S: natural, very good 6 carder suit
The above file contains a description of Precision based mainly on the version
described  by  Goren.    Additional  notes  were  obtained from other sources,
although all of the books were printed in the early 1970's,  so  styles  might
have changed, and I would appreciate comments.  Also, I have noted differences
between "standard" Precision and "simple" Precision, a form also published  by
Wei.    The  major  differences  are  using  jump  bids as negative impossible
response to 1C, omitting asking bids, omitting 1NT  forcing  over  a  1  Major
opening  and omitting Inverted Minors over 1D.  I've noted where Goren differs
from the other sources, and have  noted  where  I  have  included  from  other
sources.  Precision has been expanded by many people.  Many books cite the use
of Italian asking bids rather than CAB/TAB/AAB, and if there  is  interest  in
them I may add that info at a later date. 
Here are a few notes on specific areas which I would like to hear comments.
1C:  Interference is common after 1C.  I've  read  of  much  more  complicated
methods  for  dealing with overcalls, i.e.  having bids which convey number of
controls rather than natural bids, and wonder if that would be useful to  add.
Also,  how  many  people  play  it  that  1nt  over  a  1 level overcall is 9+
unbalanced while 2nt is 9-11 bal?  Goren specifies it, but then at the end  of
the  book  notes  that  many experts don't play it that way, and other sources
similarly conflict on it. 
1D:  The Italian version mentions that 1D should be bid instead  of  1NT  with
4-4  in  majors in order to make it easier to find low level major fits.  This
makes a lot of sense to me, so I've added it, but I don't know how many people
actually follow it. 
1NT:  I've not added the use of Jacoby transfers because if they are used, the
whole  response  structure changes.  If there is a system which is common with
Precision, I would be interested to know about it.  All the systems I've found
for  weak  1NT  bids  are fairly complicated in order to be able to handle the
wide range of possible responder's hands, and also be able to locate good fits
for possible slams.
Mark London