OTHER OPENING BIDS
  HCP see Note Min length CONVENTIONAL MEANING SPECIAL RESPONSES Notes
1♣ 9+ ¨

4

   Splinters. Inverted raises

1.1

1.2

1.3
1♦ 9+ ¨ 4  
1♥ 9+ ¨ 4   Jacoby 2NT
1♠ 9+ ¨ 4  
3 bids 0+ ¨ 6 3NT = solid minor    
4 bids 0+ ¨ 7      

DEFENSIVE METHODS AFTER OPPONENTS OPEN
Opponents Open A Natural One of a Suit CONVENTIONAL MEANING SPECIAL RESPONSES Notes
Simple overcall Usually 5+ cards    
Jump overcall Pre-emptive    
Cue bid Michaels   1.4
1NT Direct 15-17 As 1NT  
Protective 11-14  
2NT Direct 2 lowest unbid suits   1.4
Protective 20-22 As opening 2NT  
Opponents Open With DEFENSIVE METHODS SPECIAL RESPONSES Notes
Strong 1♣      
Short 1♣/1♦ Treat as natural    
Weak and Strong 1NT Landy: 2♣=both majors 2♦ shows equal length 1.5
Weak 2 Dbl for take-out; 2NT=16-18 bal. Leaping Michaels.. Lebensohl 1.6
Weak 3 Dbl for take-out    
4 bids Dbl for take-out    
Multi 2♦ Dbl: 13-15 or 19+; 2NT=16-18 Lebensohl 1.6

SLAM CONVENTIONS
Name Meaning of Responses Action over interference
Roman Key Card Blackwood 5♣=1/4, 5♦=0/3, 5♥/♠=2/5 without/with trump queen. 5NT asks for lowest side-suit king Dbl=1/4, pass=0/3, etc
 
COMPETITIVE AUCTIONS

Agreements after opening of one of a suit and overcall by opponents:

Level to which negative doubles apply

Unlimited

Special meaning of bids

If opponents overcall our major with UNT, 3♣ is forcing raise, 3♦ shows 5 in other major.

Exceptions/other agreements

Fit-jumps

Agreements after opponents double for takeout
Redouble 9+ New suit Forcing Jump in new suit Fit-jump
Jump raise Pre-emptive 2NT Good raise Other  
Other agreements concerning doubles and redoubles:
Doubles are for take-out unless: we have a fit; we have pre-empted; we are doubling a naturally-bid NT.
After penalty double of 1NT, next double by either player is take-out.
 

OTHER CONVENTIONS
Fourth-suit forcing [1♠ is natural]
After 1X-2Y, 2NT is game-forcing [3♣ requests more information], 3NT = flat 15/16
Unassuming cue-bids (show good raise of partner's suit or very strong hand)
Directional asking bids
1NT rebid is 15-17 [2♣ is checkback], 2NT rebid is 18-19
 

SUPPLEMENTARY DETAILS [1]
(Please cross-reference where appropriate to the relevant part of the card and continue on back if needed)
1.1 Splinter jump shows support for partner [min 4] with typically singleton in bid suit. A splinter bid can be an immediate response, opener's rebid, or an unnecessary [to be forcing] bid at any stage of the auction.
1.2 Raising 1♣/♦ to 3♣/♦ is pre-emptive, promising support with no 4-card major. Raising 1♣/♦ to 2♣/♦ is unlimited with no 4-card major. Not applicable over intervention..
1.3 Jacoby 2NT promises 4+ trump support and is forcing to game. Opener rebids 4-major if minimum. 3-new-suit as trial bid, 4-new-suit as splinter.
1.4 Michaels cue-bids and UNT show min 5/5, weak or strong [not intermediate]. 1m-2m shows both majors, 1M-2M is major+minor
1.5 Responder bids his longer major, or 2♦ with equal length. 2♦/♥/♠ overcalls are natural.
1.6 If partner doubles a weak 2-bid, 2NT shows a weak hand [<8] and requests a 3♣ relay. 4♣/♦ is GF Leaping Michaels showing bid suit + other major.