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Gerber - A slam convention using the bid of 4 Clubs to ask partner to disclose the Aces held. Also see Super Gerber, which requires a Club jump to initiate Gerber. The most common usage of Gerber to investigate Ace "controls" is when the partnership has not found a suit fit and have bid Notrump.
The Gerber convention is a 4 response to a no-trumps bid. Like Blackwood, it is a slam investigation bid that asks partner how many aces he holds. The difference from Blackwood is that Gerber is only used for no-trumps. This is because 1NT-4NT is natural, inviting partner to bid 6NT.
Asking for Partners Aces – Gerber. After you have discovered that your partnership has at least 33 combined points and the suit or lack of suit fit the Gerber is a bidding convention designed to describe the Aces held in partners hand to decide whether a grand slam or a small slam can be achieved.
An alternative to 4NT (Blackwood) bid of 4♣ to ask for aces. Responses are. 4♦ shows zero (or all four) aces. 4♥ shows one ace. 4♠ shows two aces. 4NT shows three aces. If you then wish to ask about kings, bid 5♣ and partner responds. 5♦ shows zero kings.
asking for Aces is normally the suit (or NT contract) that will end the bidding. Usually, NT is the contract agreed upon before Gerber was started so Partner should know that a NT bid will end the bidding.
Key Card Gerber (Mini-Max Gerber) - A slam bidding variation from regular Gerber (when trump suit has not been names), designed to increase the accuracy when considering the potential to reach slam or grandslam. This method recognizes partner's Aces for slam controls and the "playability" (point range). In response to a bid of 4 Club invite ...
Gerber is an Ace-asking convention similar to Blackwood. The difference is that Gerber uses 4♣ as the asking bid, rather than 4NT, which allows the bidding to be kept to a lower level.
