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04BIGCLB.CMA
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1995-09-11
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DEFENSE VS BIG CLUB OPENINGS
The following defense applies against artificial 1C openings that
promise 16 HCP or more:
Immediate actions over 1C tend to deny a good hand, but calls that
show two suits may be based on either a weak hand or a strong hand.
With an in-between hand, pass with a two-suiter and hope to show
your suits later. If the two suits include a major, you can
overcall 1H or 1S and perhaps bid the other suit on the next round.
Two-suiters are shown immediately by a variation of the "CRASH"
(Color-RAnk-SHape) convention:
-- A double shows both black suits or both red suits ("Color").
Advancer bids his better red suit, preferring hearts with equal
length. If overcaller then bids spades, showing the black suits (or
if the bidding makes it obvious that he has the black suits),
advancer prefers spades with equal length.
-- A 1D overcall shows both majors or both minors, 5-5 or better
("RAnk"). Advancer bids his better major, preferring hearts with
equal length. If overcaller then bids clubs, showing the minors (or
if the bidding makes it obvious that he has the minors), advancer
prefers clubs with equal length. Knowing that advancer will prefer
hearts to spades, the overcaller might have only 4-5 in the majors,
but not 5-4. Against a strong 1, two minor suits had better be at
least 5-5. With 6-5 or 5-4 in the majors it is better to just
overcall 1S and hope to bid the hearts later. Then advancer will
prefer spades when holding equal length.
-- A 1NT overcall shows both round suits or both pointed suits
("SHape": hearts-clubs or spades-diamonds). Advancer bids clubs
when preferring clubs to hearts, otherwise bids diamonds when
preferring diamonds to spades, otherwise bids hearts.
-- A major suit overcall is natural, and may be rather speculative.
-- A 2C overcall is natural, and also may be speculative.
-- Jump overcalls are preemptive.
-- A 2NT overcall is natural, based on a long solid minor plus
stoppers. Partner can raise with one quick trick.
With most good hands, including really sound one-suited hands, you
can afford to pass and act on the next round:
South West North East
1C Pass 1D Pass
1H 2/3/3D - strong jump overcall
2NT - solid minor, heart stopper
Dbl - normal takeout double
1NT - normal 1NT overcall
1/2/2D - natural, good hand
2H - normal cue bid overcall
When Opener Rebids 1NT
The chapter DEFENSE VS STRONG NOTRUMP applies after a 1NT rebid by
opener, provided that the defenders have not bid or doubled prior
to the 1NT bid. This is a good opportunity to show the "in-
between" strength two-suiter that is not eligible for CRASH.
If the response to 1C was a negative 1, a double of the 1NT rebid
is definitely for business even if you don't normally double strong
notrumps for business. This applies to both direct and reopening
doubles, and the reopening double may be based on distributed
strength, not simply on a long solid suit.
If the 1C opening received a positive response, or if the doubler
failed to open the bidding on the first round, then a double of the
1NT rebid definitely has the alternative meaning (clubs, diamonds,
hearts; or hearts only).
Actions by Fourth Seat
The meaning of a cue bid over a suit response to 1C depends on
whether the response is artificial or natural. If artificial, it
is a natural overcall and a double just shows the suit (a weaker
action than bidding the suit). A notrump overcall shows the minors:
South West North East
1C Pass 1H * Dbl - shows hearts
2H - better hearts
1NT/2NT - minors
* artificial response
When a suit response is natural, a double shows the higher two
unbid suits, a cue bid the highest and lowest, and a notrump bid
the lower two:
South West North East
1C Pass 1H * Dbl - spades and diamonds
2H - spades and clubs
1NT/2NT - minors
* natural bid
Whether the response is artificial or natural, all jump overcalls
are preemptive. With a good hand, pass and hope to act on the next
round.
For defense against the Precision 1D (or similar) opening, see the
chapter MARVIN VS FIVE-CARD MAJORS.
Over a Two Club Opening
CRASH may also be used against a strong artificial 2C opening, but
the strength distinction between immediate or delayed action does
not apply.