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MARV2D.CVA
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1995-08-30
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MARVIN TWO DIAMONDS
An opening of 2D is a three-way bid:
-- A notrump hand with 21-22 HCP and a five-card suit, or
-- A weak two bid in hearts, or
-- A strong two bid in spades, forcing to game, with an unbalanced
hand that will seldom be played in notrump.
Responses
Responder assumes that partner has a weak two bid in hearts, and
bids according to his method of responding to weak two bids. If he
would have passed a weak two bid opening in hearts, he now bids 2H.
One drawback of this convention is that responder cannot raise
hearts preemptively, because opener may not have a weak two bid.
Other than that, responder makes his normal response to a weak two
bid if he has too much to bid 2H.
If the right hand opponent (RHO) bids or doubles, responder usually
assumes the opening was based on a weak two bid and bids, doubles,
redoubles, or passes accordingly (but 2H over a double is a forcing
"positive response" in hearts). Even if RHO bids spades, however,
responder cannot raise hearts preemptively. Opener could have a
notrump hand, or even a strong two bid in spades if RHO is lying
to create confusion.
Rebids by Opener
With a 21-22 HCP notrump hand, opener rebids in notrump. In the
unlikely event that responder has made a positive response to a
weak two bid type opening (i.e., has bid 2S, 2NT, 3C, or 3D),
opener must jump in notrump in order to show the 21-22 HCP notrump
type hand. A 3NT rebid over 2NT shows a weak two bid sort of hand
with a solid heart suit. A 3NT rebid over a three-level new suit
bid shows some support for responder's suit (a practice that all
weak two bidders should employ). Likewise, a 2NT rebid over a 2S
response shows a weak two bid with some spade support.
With a weak two bid in hearts, opener passes a 2H response. After
any other response, opener rebids in accordance with the usual weak
two bid bidding sequences. He must not otherwise bid again, not
even in a competitive way with an extra good weak two bid:
South West North East
2D Pass 2H 3C
3H - strong two bid in spades, heart suit too
Dbl - optional double, 21-22 HCP notrump hand
Pass - weak two bid
With a strong two bid in spades, opener rebids in spades to show
a one-suited hand, or (as with 3H above) shows a second suit:
Opener Responder
2D 2H
3C - spades and clubs
Opener has already shown a spade suit, so now shows a second suit.
Rebids by Responder
If opener verifies a weak two bid, responder proceeds in accordance
with the usual bidding sequences for weak two bids.
If opener shows a 21-22 HCP notrump hand by bidding 2NT, the
bidding proceeds in accordance with normal bidding following an
opening of 2NT, except that a major suit response to Stayman shows
a five-card suit:
Opener Responder
2D 2H
2NT 3C
3D - no five-card major (five-card minor)
3H/3S - five-card major
We can't play that 3D shows diamonds and 3NT shows clubs, because
we must leave room for responder to show a five-card major.
If opener has had to jump in notrump to show a notrump hand because
of partner's positive response, the partnership is committed to
slam.
If opener shows a strong two bid sort of hand, the bidding proceeds
naturally, with a minimum notrump or minor suit rebid by responder
showing a "second negative," usually 5 HCP or less:
Opener Responder
2D 2H
3C 3D - second negative
Opener Responder
2D 2H
2S 2NT - second negative
A minimum bid in a major suit is natural, however:
Opener Responder
2D 2H
3D 3H - natural
Opener has spades and diamonds. Responder could have bid 3NT as a
second negative with nothing worth showing.
There is no danger of opener's passing any notrump bid, because all
these sequences show an unbalanced hand. Responder may therefore
sometimes bid notrump with substantial values when he has no good
suit to bid. If so, he must reveal these values later in the
bidding (which may not be easy).
Responder must continue bidding until game is reached, no matter
how weak his hand. One reason is that opener may have a 6-4 hand
in an auction like this:
Opener Responder
2D 2H
2S 2NT - second negative
3C
Opener "rebids" spades with game in hand, holding S-AKQJ84 H-A7 D-4
C-AKQ2, because he wants a chance to show this 6-4 holding. If
responder has S-6 H-5432 D-8743 C-10843 and unilaterally passes 2S
(or 3C), she will miss a good club slam.
Another reason for making this opening game-forcing is that opener
has an unbalanced hand. Responder cannot know if an outside king
is worth anything or not. Since he can't evaluate such a hand, the
opening might as well be game-forcing.