Jacoby 2NT is a useful convention for exploring slam when responder has support for opener's major. Here's how it works:
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Opener's Rebid. After responder bids Jacoby 2NT, opener's first priority is to show a side singleton or void:
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Without a short suit, opener should simply communicate his strength:
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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.