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2NJACOBY.NTA
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1995-08-30
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JACOBY TRANSFER BIDS
Opener Responder
2NT 3D - asks opener to bid 3H
3H - asks opener to bid 3S
With super support for the indicated suit, opener can bid higher
than the requested bid. She should have four trumps and a ruffing
value to jump to the four level or make a notrumper cue bid in
support of the indicated suit. With two of the top three honors in
the suit, she can bid 3NT with a good hand that has fast tricks
outside and no unstopped suit:
Opener Responder
2NT 3D
3H - the usual bid
4H - a super raise, including four trumps
4C/4D/3S - same (notrumper cue bid)
3NT - two of top three honors, fine hand
The 3NT rebid requires good quick stoppers outside, because
responder will pass with, say, a queen high heart suit and nothing
outside.
If responder bids 3D, then 3S over 3H, that is the Unbalanced Heart
Convention (UHC). UHC will be described next.
When responder uses Jacoby, then raises opener's mandated bid to
game, she is making a slam try. With no slam interest, use Texas.
If the transfer is followed by a 4NT bid, that is a natural slam
try in notrump, balanced hand. To use Roman Key Card Blackwood,
make a Texas transfer and then bid 4NT.
Opener Responder
2NT 3H
3S 4S - slam try
4NT - notrump slam try
This slam try shows a balanced hand with a long and strong trump
suit. With a broken spade suit, balanced or unbalanced hand, start
with 2C. With a broken heart suit, use Stayman with a balanced
hand, UHC with an unbalanced hand.
With a very strong hand, responder can follow the Jacoby transfer
bid with an asking bid at the five level. Splinter bids are not
used after a transfer:
Opener Responder
2NT 3D
3H 4S - notrump raise
The 4S notrump raise implies that responder's hearts need a good
fit to be useful for a notrump slam. When fit is not important,
responder bids 4NT instead of 4S to suggest a notrump slam.
Opener Responder
2NT 3D
3H 4NT - natural notrump slam try
5C/5D - asking bid
See chapter ASKING BIDS in the book "Strong Bidding."
If responder shows a second suit after the Jacoby response, he
probably has a strong 5-4-2-2 hand if the suit is a minor:
Opener Responder
2NT 3D
3H 4C - probably 2-5-2-4, slam try
4D - probably 2-5-4-2, slam try
With an unbalanced hand responder uses UHC with hearts, Stayman
with spades, to show a two-suiter and slam interest:
Opener Responder
2NT 3D
3H 3S - UHC
3NT 4C/4D - unbalanced, 5-4 or 5-5
Opener Responder
2NT 3C
3D 3S
3NT 4C/4D/4H - unbalanced, 5-4 or 5-5
Bidding spades and hearts this way definitely shows at least 5-5.
Use Jacoby with 5-5 or better in the majors and no slam interest:
Opener Responder
2NT 3H
3S 4H - weak hand
Lacking slam interest, responder has no reason to give opener a
chance to make a notrumper cue bid, as in the preceding sequences.
When RHO Overcalls
Jacoby is not used in competition. Texas is used only if the
overcall is 3C. A cue bid is used for Stayman unless the overcall
is 3C, whereupon 3D is Stayman:
South West North
2NT 3C 3D - Stayman
3H/3S - natural, forcing
4C - Gerber
4D/4H - Texas
4S - mild notrump slam try
4NT - stronger slam try
South West North
2NT 3D 3H/3S - forcing
4C - Gerber
4D - Stayman (probably)
4H/4S - natural, sign-off
A cue bidder may have something other than Stayman in mind, which
she can make clear on the next round (e.g., by bidding 4S after a
4H bid by opener in the last auction). Then the cue bid is revealed
as a control-showing strong slam try.