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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.
Slam Bidding in Bridge – Gerber Convention Ace Asking. If you or your partner have bid notrump at any level in the auction, you should not use 4 NT to ask for the number of aces held. You must use a different asking bid to find out this information.
Gerber. 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.
Gerber –Ace Asking Slam Convention Blackwood is not the only Ace Asking Convention. More common today is Roman Key Card Blackwood (RKCB) but that is for more advanced play. More important is GERBER which uses 4♣to ask for Aces. I suggest you use BLACKWOOD as the normal Ace asking Convention but
If Gerber is your system of asking for aces, then you may be interested in CRO Gerber which gives more specific responses. The 4c bid is an ace ask and 5c is the king ask. CRO stands for same Colour (red or black), Rank (majors or minors) and Odd (neither). Responses to 4C Responses to 5C 4D = 1 or 4 aces 5D = 1 or 4 kings
I opened with a weak 2S bid. My partner then bid 4 clubs and expected me to know that it was Gerber and that she was asking for Aces. I was confused. Should we not find a fit and should there not have been a NT bid prior to using Gerber?
