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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 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.
Remember you should not use Blackwood or Gerber to ask partner for Aces if you have a void. But if partner uses Blackwood and you have a void, there is a simple way to show it IF you have one or two Aces AND there is an agreed trump suit.
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.
know if the opponents have a cashing ace or two. You bid 4C (Gerber ), asking partner how many aces he holds. • Partner responds 4S showing two aces. Partner still has 12 to 13 high card points unaccounted for. You bid 5C to ask for partner’s kings. This bid also tells partner that all aces are held by the partnership.
Slam Conventions are NOT for getting into Slams, they are TO PREVENT you from getting into bad slams. The key to Slam Bidding is assessing the potential for slam BEFORE you consider using Blackwood or Gerber.
