RIGAL PRECISION....
(summary by Daniel Neill of ideas from Barry Rigal's excellent book, "Precision in the '90's")

OPENING 1C:

promises 16+ pts, any distribution not covered elsewhere (1NT,2D)
Responding-
1D 0-7 HCP
1H/S 8+HCP 5+suit; 1NT 8-13 HCP bal.; 2C/D 8+ HCP 5+suit GF
2H any solid 6+suit w/ no side controls OR both minors 5+/5+
2S 8-11/16+, 3 suited hand any 4441, GF 
2NT 14+ bal. 
3C 12-15 4441 black sing.;  3D 12-15 4441 red sing.
3H/S 3-6 HCP 7 crd suit, at least 1/top3, NF
4 level semi-solid suits, no outside control

1C-2H-2S (forced, unless has self-sufficient suit [2NT=spades])
      ... 2NT the minors (3C relay for further shape)
            3D short spades (3H relay : 5521, 5530, 6520, 5620; then
                  minorwood)
            3H equal shortage (3S relay: 6511, 5611; m-wood)
            3S-->4D short hearts (shape steps as above, runon, no relay)
      ... 3C/D/H/S One suiter, bid below suit
            Relay asks for shortage (3NT/4m denies); 4NT length ask(6,7..)

1C-2S-2NT(forced, unless self-sufficient suit)
      ... bids suit below sing. (if 16+, just push further at the end:))
            Relay is control ask (0-1, 2,...) OR Game signoff OR bid
            non-game suit as RKC in that suit

1C-2NT forcing to 4NT or around there; 3C relay (OR set trump suit)
      ... 3D 4 hearts;  3H 4 spades;  3S no major;
          3NT(and higher forcing to slam) 4333 16-17 no major;
          4C 16+HCP, 4 clubs + another (4D relays);
          4D 16+HCP diam. + hearts;  4H 16+ both majors;  4S spades + diam.
      After a 3 level rebid above, relay is trump ask (0,1,1+J,2,3)

1C-3C-3D relay (forced)
      ... 3H 1444(sp. sing.);  then sing. is ctrl ask (0-2,3,4) OR non-game
             suit is RKC in that suit OR game bid is signoff
      ... 3S 4441(cl.sing.); as above

1C-3D-3H relay (forced)
      ... 3S 4144 (hrt. sing.);  asks as above
      ... 3NT 4414 (diam. sing.);  asks as above

-CONTINUATIONS AFTER 1C-1D negative...

1H Forcing;  bal. 17+, or two-suiter with hearts longest
      ... 1S any 0-4, or 5-7 bal.
            ... 1NT 17-19 bal., systems on
            ... 2C/D/H 17-19 5+ hearts, 4+ in bid minor, NF
            ... 2S 20+ 5H-4S, nat. cont.
            ... 2NT 20-22 bal., systems on
            ... 3C/D 20-22, 5+H, 4+bid minor, NF
            ... 3H/S Nat. GF, 5332 with doub. in oth. major
            ... 3NT 25-26 bal. , systems on
      ... 1NT/2C 5-7HCP, unbal. 5(6)+ crd transfer to C/D. 1 rd force
            ...(over 1NT e.g.) 2C somewhat construct.;  forc. to 2NT
                  ... 2D/H/S nat. 2nd suit GF unless opener 2NT/3C
                  ... 2NT NF, suggests 6 clubs, min. bal.
                  ... 3C  NF, "  "      "  "  , min. unbal.
                  ... 3D/H/S GF, 6-4 shapes
            ... 2D (denying xfer) Nat. forcing to 2H; hearts and diam.
            ... 2H NF, shows hearts and spades, min.
            ... 2S GF, shows hearts and spades, max.
            ... 2NT NF, discouraging, suggests 17-18
            ... 3C GF, agreeing clubs (the jump accept)
            ... 3D+ GF, splinters agreeing clubs
      ... 2D/H 5-7HCP, unbal., xfer to 5(6)+ suit, typically 6 (else 1S);
            same rules as minor xfers above apply.
      ... 2S 5-7HCP, any 4441 (2NT relays for suit bel. sing., then bidding
                  singleton is control ask, others NF)
      ... 2NT 5-7HCP, 5440 shape, with 5 spades (relay/ctrl ask as above)
      ... 3C/D/H 5-7 7 crd suit. NF.
1S Natural, NF. Natural continuations:
      ...1NT Forcing NT, asks opener to bid second suit
      ...2C/D/H Natural 5-7 HCP, forcing to 2NT
      ...2S 3+ crd support, 3-5HCP
      ...2NT 4+ HCP raise of spades with side singleton(relay for it)
      ...3C/D/H Nat. 6+ suit, with support for pd's spades
      ...3S 5-7HCP, 4 crd support, no sing.
      ...double jump shifts, splinters with void   ...4S distrib. game bid
1NT/2C Transfers to 5(6)+ suit; forc.;
      ...step 1 second neg.(0-4). Opener passes or bids out with 20+
      ...step 2 RELAY 5-7HCP no 5crd major Opener bids nat.:
            ...2H/S Natural; responder's limited actions NF
            ...2NT Diamonds   ...3C Nat. min. 
            ...3D/H/S 6/4 non-minimums, GF   ...3NT to play
2D 5+ hearts, xtra values, 1/2 suited; step one 0-4, else nat. and GF, 
      except 3S unspecif. splinter raise (3NT asks) and 4C/D fit jumps
      ...step one (0-4)
            ...Pass Most hands in 19-21 range
            ...2S 5-5 hearts and minor; 2NT asks and 3C/D NF, but 3H/S GF
            ...2NT 6-4 hearts + spades, 21+HCP, forc. to 3H
            ...3C/D 6-4 21+HCP, forc. to 3H   ...3H NF (8.5-9 tricks)
2H 6 hearts, min. NF; nat. continuations
2S 8+ tricks; forcing to 3S (3C second neg.)
2NT/3C GF hands with cl./dia.; Forc.; step one is 2nd neg.
      ...so after 2NT, 3C 2nd neg., opener cont. nat.
      ... 3D 5-7 bal.   ...3H/S/NT 5-7 nat.   ...4C 4+HCP real club supp.
      ... 4D+ splinters agreeing clubs
3D/H/S As before; solid suits, GF, request. cue bid
3NT to play, based on solid suit

-CONTINUATIONS AFTER 1C-Positive Responsse

After a positive response in a major, jumps to game by opener show minimums
with no slam interest.  Jump to game in opener's own suit shows semi-solid 
suit with too many controls for a preempt.  Single jump shifts by opener 
are solid suits, demanding cue bids (responder bids an ace, NT with 2+            
kings, or just raises with 0-1 ctrls).  Double Jumps in new suits are 
splinters (implying min). A jump raise is a balanced slam try with very
nice trump support.  Strong unbalanced hands should trump ask, then splint.
*(Alternatively, jump raise can be unspecified 19+ splinter, 3M+1 can be 
unspecified min. sing. splinter, and higher splinters min with void) 
      For responder's 2nd bid, jumps to 3NT show a 
medium hand, jump raises to game of opener's suit promises min. with all 
values in the 2 suits, jump rebids by responder show semi-solid suit, and 
jumps in a new suit are splinters with fit for opener's suit.  Finally, the 
relay (one step) after opener's natural rebid shows 12+ pts.
      Opener can make a Gamma Asking Bid (GAB, or Trump Ask) by raising 
responder's positive response. The step responses are: no top honor, one TH 
with 5 crds, two w/ 5crds, 1 w/6crd, 2 w/6crd, and AKQ.  The length of the 
first and last steps can be clarified with a repeat ask.
      After the GAB, opener can relay as a control ask (0-1,2,3..) or 
proceed straight to Epsilon AB (control ask, or EAB).  Each suit bid is 
asking for what control of that suit.  The steps are no control, 3rd rd, 
2nd rd, 1st rd, and AK/AQ.  Repeat ask clarifies control by (1)strength or 
(2)length.
--------------------------------------
      After 1C-1NT(8-13 bal.) nat. bidding or 2C relay:
1C-1NT-2C
      ...2D 8-10HCP, 4 hearts   ... 2H 8-10HCP, 4 spades
      ...2S 8-10, no major      ... 2NT 11-13, 4333 or 5332 in minor
      ...3C 11-13, clubs+another ...3D 11-13, diamonds+major
      ...3H 11-13, 3433 or 4-4 majors (3S rel-> 3433/4423min/4432min/4423max/4432max)
      ...3S 11-13, 4333
After 1C-1NT-2C-2D(orH, parallel)
      ...2H Trump Ask (0,1,1+j,2,3), then EAB's
      ...2S/3C/3D nat.      ...2NT shape relay (bid another suit)
      ...3H sets trump, asks for cue-bid (or 3NT if 2 kings)
After 1C-1NT-2C-2S..
      ...2NT shape relay (5c,5d,2344,3244,3334/3343) nat. continuations
After 1C-1NT-2C-2NT..
      ...3C relay (5d,4c,4d,5c are the steps)
After 1C-1NT-2C-3C, 3D asks for 2nd suit, now raise of minor is nat., and
      new suit is cue for the major
Jumps to 4NT quant., only NON-JUMPS over MAJORS is BlWd; for BW, raise or 
cue first
After 1C-1NT-2C-3H/S, opener's new suit is cue bid for hearts

IF OPENER DOES NOT RELAY, fast arrival is ON. Responder can make 
fit-showing jumps (11-13, decent support, nice 4crds in bid suit).
-------------------------------
      When responder bids a minor response to 1C, room is conserved thusly:
1C-2C
      ...2D Relay w/ bal. hand, then
            ...2H/S nat.  ...2NT diam.   ...3C sing. suited clubs
            ...3D 5332, 8-11HCP   
            ...3H/S/NT 5332 12+HCP, suit below doub., Relay now for ctrls
      ...2H/S Nat.   ...2NT diam.   ...3C GAB  ...3D+ solid suit..3NT 19-20
and
1C-2D
      ...2H Relay w/bal. hand
            ...2S/3C nat.   ...3D sing. suited diam. 3H/S/NT 5332 12+ above
            ...2NT hearts/bal 8-11 (3C relay: 3d Hearts, 3H/S/NT und. doub.
---------------------------------

-DEALING WITH INTERVENTION OVER 1C

I.  Responder's non-jump actions are nat. and GF, although shaded values.  
Jumps still NF semi-positives.
II.  Doubles by Responder show 5-8 HCP, forc. to 2NT unless suit rebid or 
"preferred" .  Raises would be forcing though.  Doubling at the 3 lev. is 
GF.  All subsequent doubles would then be pen./def. oriented.
III.  Pass by reponder shows 0-4HCP. Subsequent doubles for takeout.
IV.  After Pass/Double by responder, NT rebid by opener means syst. on.
V.  Opener's simple suit rebids at her first turn are nat. never cues 
(unless ememy preempted there).
VI.  If opener doubles for takeout, responder's subsequent doubles are 
responsive.  Anytime else, subsequent doubles are pen.-oriented.

LIMITED OPENINGS:

OPENING 1D:

normally bal. 11-13, unbal. long diamonds, minor hand, or long clubs not 
good enuff for 2C
Responding-
2C 10+HCP, nat. GF unless suit rebid (BUPH): opener rebids..
      ...2D Unbal non-max. w/5+diam.   ...2H/S Reverses w/ xtra val.
      ...2NT 11-13 bal. NF   ...3C 4+ clubs, NF   ...3D 6+ diam., max. GF
      ...3M splinter raise, GF    ...3NT solid diamonds
2D 10+HCP, nat., inv. min.;  bid stoppers
2H/S/3C GF 15+ pts;  either excell. suit OR diam. supp. OR intend NT rebid
2NT 11-12 bal. invit.
3D 6+ diamonds, preemptive     3H/S/4C splinters    3NT 13-15 bal.
After 1D-1S(H)-1NT... Two-Way NMF:
      ...2C invit. relay  (opener shows 3crd supp., 4 hearts, else bids 2D)
            ... then 2H/S/NT invit. by responder
      ...2D GF relay (opener bids nat. at 2 or 3 lev.)
      ...2H/S to play   ...2NT to play in a minor  ...3C/D invit 5(6)-4
      ...3H 5-5 invit.   ...3S good spades invit.
Also, after 1D-1M-2M Two-Way game tries (relay for help try, else short)

When responder bids a major, opener has some jump rebids:
e.g. 1D-1H
...2S either diamonds and spades (nat.) OR a splinter raise (2NT asks)
      ...3C sing. club, min.   ...3D 6D/5S   ...3H sing. spade, min.
      ...3S/NT sing. club/spade, max.
...2NT values for a jump to 3D; 0-2 hearts
...3C both minors, strong, NF   ...3D values for the bid, but 3 hearts
...3H 2542, max.
for the 1D(H)-1S case, 2NT is either self-jump w/out support OR splint.

OPENING 1H/S:

promises 11-15 w/ 5+suit, like standard (1NT forc., J2NT, splint., Rev. 
Drury), 2/1 forcing to 2NT   (may play Bergen, other conv. raises)

OPENING 1NT:

promises 14-16 bal., like standard (stayman, 4way xfers, texas, lebensohl)

OPENING 2C:

promises 11-15 with 6+ clubs or 5+ and a major
Responding-
2D inquiry at least invit.
   ...2H/S 4 crd major (then 3D stopper ask [rebid major=diam.],jumps spl)
   ...2NT non-min. bal (3D stopper ask: hd,sd,hs)
   ...3C min. (3D stopper ask: h,s,d)
   ...3D 6-4 in minors, non-min.  ...3H/S 6-5 in bid suits  3NT solid clubs
2H/S 8-12 5+ suit, invit. NF
2NT relay forces 3C, then...
   ...pass preempt. raise ...3D GF sing. suiter in diam.  
   ...3H/S/NT GF 2-suiter in hs/sd/dh (suit bid and next one)
3C real invit.
3D/H/S GF natural  3NT to play 4D/H/S splinters  4NT RKC for clubs

OPENING 2D:(MULTI)

promises either weak 2 in a major OR 23-24 bal. OR 20-23 any 4441
Responding-
2H pass/correct (bids 2NT or suit below sing. with strong hands)
2S invit./preempt in hearts (passable;  opener rebids 3C with hearts, else 2NT or
   suit below sing.;  after 3C, opener can signoff  3H or bid 3D invit.)
2NT strong inquiry (opener rebids 3NT, or 4C+ below sing. if strong)
   ...3S crappy weak 2 in spades; contin. are cues
   ...3H good spade suit GF, 3S asks for shortage, else cues
   ...3D good heart suit GF, 3H asks for shortage, else cues
   ...3C all the rest
      ...3D interest in spades (3H bad hearts, 3NT good hrt hand, else cue)
      ...3H interest in hearts (3S good spade hand, 3NT bad hrts, else cue)
3C transfer to 3D (unless superb suit) and then bids GF sing. suiter H or S
   if opener transfers and bids at 4 level, shows clubs and that suit
3D GF sing. suiter in Diamonds
3H/S preemptive pass or correct
3NT to play   4C asks opener to xfer to her suit  4H/S to play!

After showing 3 suiter (below sing.), relay prepares signoff, suit below 
   game is RKC for that suit, 3NT to play, 4 of sing. is to play, game bid
   in suit is slam invit. (else use relay), 4NT Quant.
After showing 23-24 bal, stayman, jacoby, gerber(jump) on

OPENING 2H:

promises 11-15 3 suiter short in diam. (5134,5143,5044,4144)
Responding-
pass/2S/3C to play   3D invit. to 3NT with excell. diam.
3H/S/4C invit. (5 crds in major)   4H/S to play
2NT relay:
...3C 4144 (then 3H/S GF setting suit, 3D relay for info:
      ...3H min. [3S now to play] ...3S max  ...3NT non-min. AorK of diam.)
      after max hands, 4D is end signal, 4suit is RKC for that suit
...3D 5134 (3H relays for range, 3S is GF setting suit)
...3H 5143 min. (3S now to play)
...3S 5143 max. (end-signal,RKC in effect)
...3NT/4C 5044 min/max

OPENING 2S:

promises 6-9 with clubs and another (5-5 min. unless fav. vuln.)
Responding-
2NT strong ask (opener rebids one under second suit, then..)
   ...preference is invit.   ...3NT to play
   ...cheapest bid otherwise shape inquiry
      ...in steps, hi sing, lo sing, hi void, lo void, 1-1, 0-2,2-0
         ...then to play, or RKC1430 (relay for # queens)
3C to play     3D pass or correct

OPENING 2NT:

promises 6-9 with diamonds and a major, OR both majors (as above)
3C strong ask (opener rebids d with reds, h with sd, s with majors)
   ...preference is invitational,   ...3NT to play  
   ... else inquiry as above
3D pass or correct        3H pass or correct