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Be careful what you read on double-fit hands. Here, the par result is
7S doubled, barring voids, and buying it for 6H could be very good. You
do not design a bidding system expecting uncontested bidding when the
opponents have 19 HCP and 19 black cards. In standard, North opens,
South goes through 1NT forcing to show a 3-card limit raise, after which
North can use some sort of exclusion Blackwood. Sure, except the opponents
around here will up to 4S or 5C on the first round. In real life, this
will be a high-level competition problem.
bb
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| Hard to beleive the opps won't interfere, but how about:
1H-1N Forcing (3-card limit)
2D-2S Impossible spade bid - shows limit with double fit
3C-3S-4D-4H Cue bids and attempt at signoff
5N-6C Grand slam force - response shows HA
?
A little contrived maybe, but not bad. The 2S advanced cue should
tell partner about the double and limit raise values. Partner takes
control after learning about the double fit and spade control.
Now the only losers are trump and maybe diamonds. The 9-card fit
in diamonds gives chances for them coming home without knowing
about the diamond queen, and the 10-card trump fit means the queen
is likely to fall.
I can't think of a way to get keycards for diamonds, which would
tell you about the DQ - an all important card for bidding the
grand slam with certainty.
BTW, I think 2D is a sufficient rebid on this hand. If partner
has a club bust, I don't want to get too high - although I am
worried about where the spades are when partner bids 1NT. The
hand reaches it's full potential when the double fit becomes known.
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