from Alfredo Versace and Lorenzo Lauria System

2NT Opening Responses - Note: same development for all strong balanced openings:

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)

 A Summary of the Same Development