System       Acol: 4 card majors and weak NT 
(special opening bids at 2/3-level)
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1-level opening bids

1NT           1NT: 12-14 hcp (1NT-rebid: 15-17 hcp) 
              -> Stayman, transfers M & m, Baron, 
Rubensohl
Majors       4 cards - usually opening lowest 4 card,
             so 1 in a major usually shows a 5card anyway
              -> 2M:  3-card, 6-9 hcp 
                 2NT: 4-card, limit or better (balanced)
                    -> 3C:  5-card, 11-14 hcp, unknown short suit
                            5-card, 18-19 hcp, 5-3-3-2 or 5-4-2-2
                       3D:  5-card, 12-14 hcp, no short suit
                            4-card, 18-19 hcp, 4-3-3-3 or 4-4-3-2
                       3M:  5-card, 15-17 hcp, 5-3-3-2 or 5-4-2-2
                       3oM: 5-card, 15+ hcp, unknown short suit
                       3NT: 4-card, 15-17 hcp, 4-3-3-3 or 4-4-3-2
                       4X:  11-14 hcp with a two-suiter
                 3C:  4-card, 7-9 hcp balanced
                 3D:  4-card, 7-9 hcp unbalanced
                 3M:  4-card, 0-6 hcp preemptive raise
                 3oM: 4-card, GF with unknown void
                 3NT: 4-card, singleton in other major
                 4X:  4-card, singleton 

Minors       4 cards
              -> inverted minors
                 2m:  9+ hcp, 
                 2NT: 0-6 hcp, preemptive raise
                 3m:  6-9 hcp, denies  

!!! 3rd hand openings can be very light !!!
    -> Reversed drury 
       2C: 10-11 hcp, usually with support

Other conventions

  Bourke relay (3rd suit forcing)
  4th suit game forcing
  Transfer bids over overcalls
  Transfer bids and Crowhurst after 1NT-rebid
  Trial bids
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2-level opening bids in 1st and 2nd hand

2C multi: weak hand 6-9 hcp with both majors or 2NT 20-21 hcp
              -> resp. will show pref. for a major or bid 2D
                 or 2NT as relay bids
2D multi: weak hand with a major 6 card or NT 22-24 HCP
2H/2S        muiderberg: 5 card H/S & minor 4+card 6-9 hcp

!!! 2-level opening bids in 3rd hand !!!

2C/2D/2H     DOBTO: less than 11 hcp - the suit 
bid and another suit 

2C might be a 3-card in a 4-3-3-3 or with 5 diamonds

2-level opening bids in 4th hand same as in first 

================================

High level opening bids

2NT 3C 3D 3H preempt bid in transfer or GF 
2-suiter with the transfer suit and another or GF one suiter 2 suits up 
3S solid minor suit  = gambling 3NT (no side suit stop)
3NT a 4C or 4D opening (descent suit)
4C - 4D      transfer for 4H  -  4S

!!! Preempts may be very light in 3rd hand
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Overcalls    8-16 HCP, cue is 1 round force, usually with support
jump overcalls  weak
NT-Over     2nd: 16-18
             -> 2C Stayman, transfers and other conventions still on
             4th: 10-14
              -> cue = asking, other natural
             unusual: two unbid suits 
Cuebids      2-suited (usually 5-5)
Doubles      Negative -> 4H!
VS.Doubles   New Suit Force 1-level, 2NT = Limit 
raise with 3 card support  
Vs.Preempts  Dbl is takeout, 2NT over weak 2 = 16-19 hcp, balanced

Slam-Bids    Mixed cue bids
             RKCB with 5 aces, one over one after 
RKCB asks for Q of trump
             Josephine 5NT
             Splinter bids
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Leads        3rd or 5th best 
             Rusinow (second from sequence) except in partner's suit
Carding      low encouraging on sequence leads; 
             count and lavinthal signals whenever if necessary
             low discard discourages, high encourages
             frequent count signals (high low is even)
             Reversed Smith call: high card asks for a switch
             Lavinthal when necessary (e.g. singleton in dummy)
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Suggested defence against 2- and 3-level opening 
bids in 1st or 2nd hand 

2C     DBL    shows clubs and 12 or more hcp, 2D shows diamonds  
       2H/2S  show a stop and suggest a problem in other major for NT, < 15 hcp
       2NT    natural, 16-18 hcp
       With weak take out double type hand pass one round, then enter the bidding
2D     DBL    shows diamonds and 12 HCP
       2H/2S  natural and constructive overcall
       2NT    16-18 hcp
       weak jump bids 
       with take out double type hand pass one 
round, then enter bidding

Suggested defence against 3rd hand openings

  imm. double take out      
  overcalls constructive 
  2NT: 16-18 hcp  

Suggested defence against 3-level opening bids

  use same routines as against 3 level preempts or 
  pass one round then enter the bidding when the 
  preempt is confirmed
  imm. cue bid of the preemptive suit shows a 
  strong 2-suiter or 1-suiter

trong 2-suiter or 1-suiter

ss one 
round, then enter bidding

Suggested defence against 3rd hand openings

  imm. double take out      
  overcalls constructive 
  2NT: 16-18 hcp  

Suggested defence against 3-level opening bids

  use same routines as against 3 level preempts or 
  pass one round then enter the bidding when the preempt is confirmed
  imm. cue bid of the preemptive suit shows a strong 2-suiter or 1-suiter

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