4NT can mean a number of things, depending on the situation.
* As a jump bid, after partner's last natural bid was a suit, 4NT is typically Blackwood.
* As a jump bid, after partner's last natural bid was notrump, 4NT is typically a quantitative slam invite.
* As a nonjump bid, 4NT may simply be a signoff.
* In response to Gerber 4♣, 4NT shows 3 aces.
* As an opening, 4NT is usually a form of ace asking bid, e.g. Blackwood.
* As an overcall, it typically shows a two-suiter (unusual notrump overcall).
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| - 4NT can mean a number of things, depending on the situation.
* As a jump bid, after partner's last natural bid was a suit, 4NT is typically Blackwood.
* As a jump bid, after partner's last natural bid was notrump, 4NT is typically a quantitative slam invite.
* As a nonjump bid, 4NT may simply be a signoff.
* In response to Gerber 4♣, 4NT shows 3 aces.
* As an opening, 4NT is usually a form of ace asking bid, e.g. Blackwood.
* As an overcall, it typically shows a two-suiter (unusual notrump overcall).
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| - 4NT can mean a number of things, depending on the situation.
* As a jump bid, after partner's last natural bid was a suit, 4NT is typically Blackwood.
* As a jump bid, after partner's last natural bid was notrump, 4NT is typically a quantitative slam invite.
* As a nonjump bid, 4NT may simply be a signoff.
* In response to Gerber 4♣, 4NT shows 3 aces.
* As an opening, 4NT is usually a form of ace asking bid, e.g. Blackwood.
* As an overcall, it typically shows a two-suiter (unusual notrump overcall).
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