2 NT fitted (Sayc)

The Jacoby 2 NT is a convention that can be used by the Responder on the opening of 1 in a major ..
This response which is very precise promises :

This 2 NT is conventional ; it asks the opener to describe his hand further so that slam prospects can be investigated properly.

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Problem E20520 Jacoby 2 NT is a Game forcing bid (and invite ro investigate a possible slam) that promises a 4 cards fit and at least 13 HCP

Openers rebids after a Jacoby 2NT
Different systems exist. Zia recommends the following one :

a singleton at the 3 level (3♣ for ♣ shortness, 3♦ for ♦ ...)
a three level trump rebid shows 17+HCP and slam interest. It asks responder to describe his hand further
Bidding a new suit at the 4 level shows a two suiter at least 5-5
Bidding 3NT shows a balanced hand and 13 to 15 HCPs
Rebidding the opening major at the 4 level si a signoff, showing a minimum hand !

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Problème E20521
After a Jacoby 2NT , the opener will show a shortenr by bidding a new suit at the 3 level

Problème E20523
With a 5-5 two suiter, the opener will bid his 2nd suit at the 4 level

Responder's rebids
Responders rebids will primarily aim to explore potential slam opportunities :

After any 3 level rebid by the opener, the responder can bid any suit to show a first round control (ie Ace or void)
After any rebid by opener, 4NT is RKC Blackwood

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Problem E20524 With a minimum hand the opener tries to tamper the ambitions of the responder

Problem20525 On our way to a slam