So partner opens 1M (so one of a major suit)….and assuming no intervening bids you now bid 2NT which is Jacoby 2NT. This is a game forcing bid showing 4 card Major support and a good 12 points plus.

The responses are:-

  • 3♣ – A non-minimum hand with singleton/void in clubs
  • 3 – A non-minimum hand with singleton/void in diamonds
  • 3 – A non-minimum hand with singleton/void in hearts OR a 6 card hearts suit if 1 was the opening bid.
  • 3♠ – A non-minimum hand with singleton/void in spades OR a 6 card spades suit if 1♠ was the opening bid.
  • 3NT – Better than minimum hand
  • 4♣ – A good 5 card suit
  • 4 – A good 5 card suit
  • 4 – A good 5 card suit if 1♠ was the opening bid or a minimum hand if 1 was the opening bid
  • 4♠ – A minimum hand

Suppose partner gives a positive response then all bids after are considered cue bids. It’s possible to play 3NT as ace asking or frivolous/serious 3NT…but when you’ve agreed a 9 card fit in a Major….it usually makes sense to play in 4 of the Major.

For a different version why not check out Swedish Jacoby.