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GERBER.NTA
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1995-08-30
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GERBER
A 4C bid is sometimes used to inquire about aces and kings:
1) A 4C bid in response to any notrump opening or notrump overcall:
Opener Responder
3NT 4C - Gerber
2) A 4C bid immediately following a 2D response to Stayman:
Opener Responder
1NT 2C
2D 4C - Gerber
3) A 4C bid immediately following a 3D rebid by a Stayman bidder,
when opener has shown a major suit (or both majors):
Opener Responder
1NT 2C
2H/2S/2NT/3C 3D - artificial, forcing
Any 4C - Gerber
The 2NT and 3C responses show both majors. See FORCING STAYMAN in
the book "Strong One Notrump Opening" for an explanation of the 3D
bid. An immediate 4C bid over 2H or 2S would be a splinter bid, so
responder must get to Gerber in this manner.
4) A jump to 4C over any 2NT rebid or response, even if clubs have
been bid.
Except for 1) and 3) above, a non-jump 4C bid is not Gerber. The
reason is that a natural 4C bid is too valuable to give up, even
when clubs have not been bid previously. When 4C is not Gerber, it
is still possible to ask for aces by using Super Gerber. See SUPER
GERBER in this book.
Gerber is not used opposite a 1NT rebid or response:
Opener Responder
1S 1NT
4C is a splinter bid
See SPLINTER REBIDS BY OPENER in the book "Four-Card Majors."
Opener Responder
1C 1S
1NT 4C - splinter
See SPLINTER REBIDS BY RESPONDER in the book "Four-Card Majors."
Gerber is not used after a jump takeout of a 1NT opening, because
responder's later bid of 4NT is Roman Key Card Blackwood (RKCB):
Opener Responder
1NT 3 any
3NT 4C - natural
4NT - RKCB
Responses to Gerber
Opener Responder
1NT 4C - Gerber
4D - 0 or 3 aces
4H - 1 or 4 aces
4S - 2 aces, 0-2 kings
4NT - 2 aces, 3-4 kings
If an opponent interferes by bidding over 4C, the DOPI principle
applies: Double shows 0 or 3 aces, pass shows 1 or 4 aces, next
rank up 2 aces and 0-2 kings, and next rank with 2 aces and 3-4
kings.
If an opponent doubles the 4C bid, a pass shows 0 or 3 aces,
redouble shows 1 or 4 aces, 4D shows 2 aces with 0-2 kings, 4H
shows two aces with 3-4 kings.
If an opponent doubles a response to a Gerber asking bid, a pass
implies no first or second round control of the suit, while a
redouble confirms control. If he knows where he is going, the asker
is free to ignore the double and continue the auction, whether or
not he has control of the doubled suit:
South West North East
1NT Pass 4C Pass
4H Dbl Pass - no heart control
Rdbl - 1st or 2nd round control
5C - asking about kings
North's pass of the double might be based on a hand such as S-A3
H-987 D-KQJ10876 C-A, with West possibly holding H-AK or even
H-AKQ. South should bid 4NT with the king of hearts, redouble with
the ace. If South bids 4NT, North can bid 6NT. If she redoubles,
North will probably bid a safer 6D. With no first or second round
heart control herself, South bids the next higher ranking suit,
after which North will place the contract.
To Sign Off
The Gerber bidder signs off by bidding notrump or a previously bid
suit (excluding artificial bids, of course).
To Ask for Kings
The 4C bidder bids five of the lowest ranking unbid suit to ask
for kings. A suit that has only been bid artificially is considered
"unbid."
Opener Responder
1C 1D
2NT 4C
4S 4NT/5C/5D are all sign-offs
5H asks about kings
The king request does not guarantee that all aces are held by the
partnership.
King Responses
Kings are shown as follows:
Opener Responder
1NT 4C
4D 5C - asking about kings
5D - 0 or 4 kings
5H - king of hearts, or the other three
5S - king of spades, or the other three
5NT - king of diamonds, or the other three
6C - king of clubs, or the other three
Note that a notrump response shows the king above the asking suit
or the other three kings.
To show two kings, responder jumps. In the auction above, two kings
are shown in this fashion:
6D - two kings, same color (cheapest jump)
6H - two kings, same rank (major or minor)
6NT - two kings, pointed or rounded suits
Mnemonic aid: CRASH (Color, RAnk, SHape). The pointed suits are
spades-diamonds, rounded are hearts-clubs.
If the questioner cannot risk the high contracts that the two-king
responses may lead to, then she must not ask about kings.
See also the next chapter, QUICK TRICK RESPONSES TO GERBER.
The Jump to 5NT
If the Gerber bidder jumps to 5NT after partner's response, that
is the Grand Slam Force (described in the book "Strong Bidding").
If two or more suits have been named, the last naturally bid suit
is assumed to be the key suit:
Opener Responder
1D 2C
2NT 4C
4S 5NT - Grand Slam Force
Responder is asking if opener has two of the top three honors in
clubs, with which opener must bid 7C.
A non-jump 5NT bid is a sign-off.