Jacoby 2NT

Jacoby 2NT is a useful convention for exploring slam when responder has support for opener's major. Here's how it works:

After a major-suit opening, a jump to 2NT shows:

• game-forcing strength,

• 4-card major-suit support, and

• possible slam interest.

Opener's Rebid. After responder bids Jacoby 2NT, opener's first priority is to show a side singleton or void:

1 — 2NT —	3:	Shows a singleton or void in clubs.
	3:	Shows a singleton or void in diamonds.
	3:	Shows a singleton or void in spades.

Without a short suit, opener should simply communicate his strength:

1 — 2NT —	4:	Shows 13 points and no short suit.
	3NT:	Shows 14-15 points and no short suit.
	3:	Shows 16+ points and no short suit.

Note that stronger hands bid lower (to leave more room for exploring slam).

FURTHER NOTES:

1. After opener's rebid, any further new-suit bids are control showing, and 4NT is Blackwood.

2. Jacoby 2NT is off after any interference.

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