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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.
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.
The Gerber convention is a 4C jump response to a no-trumps bid. Like Blackwood, it is a slam investigation bid that asks partner how many aces he holds.
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.
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.
Gerber is a Slam Convention using the bid of 4C to ask partner how many Aces they hold. 4C is Gerber ... . when it’s a jump bid immediately following a natural 1NT or 2NT bid. 1NT - 4NT (16+ HCP) . when opener’s last natural bid was notrump and no suit has been agreed upon. 1C - 1S 1NT - 4C. 1D - 1H 2NT - 4C. . after a transfer. 1NT - 2H 2S - 4C.
Gerber, bidding 4♣, is used directly after a NT bid by your partner to ask how many Aces she holds. A follow up bid of 5 NT (for 1 & 2) or 5♣ (for 3) can be used to ask for more information about Kings, but you would only do this if considering a Grand Slam (winning all 13 tricks)
