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Bid the correct grand

I ran into this hand in a recent robot tournament on BBO.  At the table, I got to the non-making 7C (it's hard to bid this with the robots).  

 

West
1095
95
QJ1063
Q73
North
J
KQJ843
AK4
652
East
743
10762
98752
8
South
AKQ862
A
AKJ1094
D

 

South deals with a 1-loser hand, his partner has a good 14-count opposite, and yet it is hard to bid a making grand slam.

What grand slams make?

  • 7C is clearly off the trump queen.
  • 7S does not make as you have the same club loser.
  • 7H makes, but only because dummy has the HJ.
  • 7NT is making.  It seems that communications are blocked on a spade lead, but declarer can win with the spade J, jettison the heart Ace on a high diamond, and eventually win 6 spades, 3 hearts, 2 diamonds and 2 clubs.

Can you bid to a good grand slam accurately?  I've found that a strong club opening and relay system can get you to 7H, but only because N relays his entire shape (1633) and gets to show the AK of diamonds and the KQJ of hearts:  The J is a key card, so your relay system needs to be able to locate Jacks.  In order to bid to 7NT, you also have to locate the stiff J of spades in N, and I think that is probably a lost cause.

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