A bridge bidding convention
used in determining a partnership
readiness for a slam
by asking for aces
After a 1NT or 2NT bid, a jump to 4C is Gerber and asks partner to
respond with a bid that indicates the number of aces he holds.
4D indicates zero or four aces, 4H one, 4S two, and 4NT three. The
4D response is not ambiguous because if a partnership is even
considering the possibility of slam in no-trump, they cannot possibly
lack all the aces (16 of the 40 high card points).
After the response, 4C bidder may bid 5C, which guarantees their
side holds all four aces, and asks partner to indicate the number
of kings he holds in the same manner as for the aces above.
Some partnerships play Gerber in any auction sequence in which a
notrump contract is implied, while others play it only directly after
a notrump bid (and then, after 3NT it is not Gerber because 4C is the
lowest possible bid above 3NT). Use Blackwood in other situations
to ask for aces.
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