♣ - ♦ - ♥ - ♠

from BIG BANG SYSTEM (2017) - NORBERTO BOCCHI

2NT Opening Responses

2NT 3♣ = ask for Majors with at least one 3-card or 4-card Majors or 5+ ♠ + 4+ ♥, GF+ (1)

Responder can have: 5+ ♠ and 4♥, 3.3. or 4.4 or 5.5. in Majors, 4M + 5+ m's, one 4-card M's BAL

3♦ = 5+ ♥, GF+ but could be weak very UNBAL with 6+♥

  Responder can have: 5+ ♥ GF, any 5+ ♥ + 4♠, 5♥ + 4+ m's

3♥ = 5+ ♠, GF+ but could be weak very UNBAL with 6+♠

  Responder can have: 6+♠ GF, 5♠ and 4+m's

3♠ = both minors semiBAL or UNBAL, GF+ or m's single suite SI (opener forced to bid 3NT)

3NT = SIGN OFF

4♣ = SI+ in ♥

   4♦ = SI+ in ♠

  4♥ = GF in ♣ (could be slammish in case opener is very strong)

4♠ = GF in ♦ (could be slammish in case opener is very strong)

4NT = 4.3.3.3 quant. SI, NF

5♣/5♦ = SIGN OFF, normally an 8-card suit, very weak w/out controls (e.g. ♠== - ♥xx - ♦xxx - ♣xxxxxxxx)

5NT = 4.3.3.3 quant. for 7NT

(1) 2NT 3♣

3♦ = one or both Majors

3♥ = NO 5 or 4-card Major

3♠ = 5-cards in ♠

3NT = 5-cards in ♥

Example:

(1) 2NT 3♣

3♦ 3♥ or 3♠ = shows the other 4-card Major (SWITCH) and denies 4+4 in M's, GF+

3NT = SO, just for looking for 5-card in M's

4♣ = both M's, at least 4.4 or 5+♠ and 4♥, SI

  4♦ = both M's, at least 4.4 or 5+♠ and 4♥, GF or slammish

4♥ = 4♥ may have 4♠ but hs better than sp

  Pass 

4♠ = EVEN KCs from 5 --> 4NT = ♠ cue, 5m = m cue w/o ♠ cue,

  5♥ = 1 KC SO, 5NT = all KCs + Q♥

***ATTENTION*** By continue cue-bidding, OPENER shows adeguate KCs controls for slam 

but say nothing about the Q♥, if he hold it then he will bid the slam,

  4NT = ODD KCs from 5 --> 5♣ = ♣ cue, 5♦ = ♦ cue w/o ♣ cue

5♥ = 2 KCs NF, 5NT = all KCs + Q♥

5♣ = ♣ void XLBW (Steps: 1st = 0, 2nd = 1, 3rd = 2)

5♦ = ♦ void XLBW (Steps: 1st = 0/1, 2nd = 2, 3rd = 3)

4♠ = 4♠, may have 4♥ but sp better than hs

4NT = EVEN KCs from 5

5♣ = ODD KCs from 5 with ♣ cue ***we do not show voids when 5♣ is used for KCs

5♦ = ODD KCs from 5 w/out ♣ cue ***we do not show voids when 5♣ is used for KCs

  4♥ = 6+♣ UNBAL with 3M or 5♣(332) SI+

  4NT = declines invitations (always with 2 KCs and bad trumps) --> 5♣ = slam going w EVEN KCs

  5♦ = max with ODD KCs

4♠ = accept invitations with EVEN KCs (if only 2 KCs then ♣AK and 3 Kings)

***WARNING*** Responder signs-off in 5♣ with 0/1 KC but opener with 4 KCs continues:

5♣ = 1 KC, NF if opener has only 2 KCs

5♦ = slam going, at least 2 KCs, asks Q♣ -->

5♥ = ♥ cue and Q♣, 5♠ = ♠ cue NO ♥ cue and Q♣, 5NT = no Q♣, 6♣ = Q♣ no M cues 

5♣ = MIN with good fit, I don't want to play 4NT

5♦ = MAX EVEN KCs --> 5♥ = 2 KCs no Q♣, 5♠ = ?, 5NT = 1 KC NF, 6♣ = 2 KCs and Q♣, 

5♦ = accept invitations with MAX and ODD KCs (3 or 5) and at least ♣Hxx

  4♠ = 6+♦ UNBAL with 3M or 5♦(332) SI+

4NT = declines invitations (always with 2 KCs and bad trumps) --> 5♣ = slam going w even KCs

5♦ = max with ODD KCs

5♣ = accept invitations with EVEN KCs (if only 2 KCs then ♦AK and 3 Kings)

  ***WARNING*** Responder signs-off in 5♦ with 0/1 KC but opener with 4 KCs continues:

5♦ = MIN but good fit, I don't want to play 4NT

5♥ = MAX, ODD KCs (at least 3)

  4NT = BAL and 44 in minors, QUANT for 6NT, NF -->

  PASS, 5m = 4m + 2om MIN, 6m = 5m --> PASS with min, 6m

  5♣/5♦ = Sign Off

*rare* 5NT = BAL and 44 in minors, QUANT for 7m/7NT, -->

6m = 4m + 2om, with MIN --> Pass, EVEN ODD KCs with MAX

6♥/6♠ = 4♣/4♦ MAX,

  6NT/7NT = 4m.3.3.3 or 4.4.(32) MIN or MAX

7m = 5m and MAX

from Alfredo Versace and Lorenzo Lauria System

2NT Opening Responses

3♣ = Puppet Stayman, may have 5-5 majors slammish, or 5♠-4♥

  3♦ = at least one major

  3♥ = 4 spades --> 3♠ = fit, 3NT = no fit [4m = 5+m crds slammish])

  3♠ = 4 hearts

  3NT = no fit (4m = 5+m crds slammish)

  4♣ = good hand for ♥ slam

  4♥ = bad hand for ♥ slam

  3NT = no major, to play

  4♣ = 4+-4+ majors, slammish

  4♦ = 4+-4+ majors, no slam

  4♥ = 5+♣ slammish

  4♠ = 5+♦ slammish

  3♥ = no majors

  3♠ = prepares a signoff in 3NT, or minor suit slamtry

  3NT = forced

  Pass = to play 3NT

  4♣/4♦ = 4 cards slammish

  4♥/4♠ = 5♣/5♦ slammish

  3NT = 5♠-4♥ NF

  4♣ = 3 spades good hand for slam

  4♠ = 3 spades bad hand for slam

  4♣ = 5-5 majors, slammish

  4♦ = declines, puppet to 4♥ to P/C

  4♥/4♠ = accepts (pd may RKC now)

  3♠ = 5 spades (4m = 5cards slammish, 4♥ = slamtry ♠)

  3NT = 5 hearts (4♣ = 5 cards slammish, 4♦ = puppet to 4♥, 4♠ = slamtry 5♦)

3♦ = 5+♥, including 5♥-5♠ no slam, or 5♥-4♠, or signoff in 4♥

  3♥ = denies 4 hearts

  3♠ = transfer to 3NT

  3NT = doubleton heart

  4m = 4 cards slammish

4♥ = 5♠ slammish

  4♣ = ♥ fit, good for slam

  4♥ = ♥ fit, bad for slam

  3NT = 5♥-4♠, NF

  4♣ = good hand for ♥ slam

  4♦ = good hand for ♠ slam

4♣ = 5♥-5m slammish

  4♦ = ♥ fit, good for slam

4♠ = asks l/m minor

4♦ = 5♥-5♠ no slam

4♥ = how to sign off in 4♥

  3NT = max, 4 hearts (4♦ = retransfer)

  4♥ = min, 4 hearts

3♥ = 5+♠, including a signoff in 4♠

  3♠ = denies 4 spades

  3NT = c.o.g.

  4♣/4♦ = natural slammish

  4♠ = to play

  3NT = max, 4 spades (4♥ = retransfer)

  4♠ = min, 4 spades

3♠ = 5+-4+ minors, GF (3NT = no great minor fit, 4♣/4♦ = 4 cards suit oriented)

3NT = to play

4♣ = slamtry 6+♥ (4♦ = countertry)

4♦ = slamtry 6+♠ (4♥ = countertry)

4♥ = slamtry 6+♣ (4♠ = countertry)

4♠ = slamtry 6+♦ (4NT = RKC ♦, 5♣ = countertry)