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Gambling or Not?

This is the second last deal in 1/4 Finals in the 2018 National Youth Bridge Championship.

Board 13
Vul: Both
Dealer: North

East
♠ K6                       East      West
♡ AKJ2                    2♣         2♠
♢ AKQ2                  2NT       3♠
♣ A85                      4♣         4♢
                               4NT       5♣
                                5♢         6♠
                                 ?

We fell behind 20 IMPS in the first segment of two segments knockout tournament.
The score sheet of the second segment is as followings:

Board 2: We chose a wrong from 3NT and 4♠
Board 5: No one would reach a small slam which only  26 points in sum without any singleton.

Board 10: Make or not depends on the leading
Board 11: Similar to Board 5. So it was impossible for teammates to get a small slam.

NOW, THE SECOND LAST DEAL COMES!!!
It reminds me of the situation that my friend faced in 2017 Michael Seamon JUSBC U26 USA2 Finals. Gambling or not, that is a question. From my perspective, there is a large chance for a grand slam. If defender doesn't lead ♣, as long as partner holds ♢J or defender holds 3 cards of heart with Q or doubleton ♡Q, 7♠ is a immortal contract. In addition, if partner holds 3 cards of ♡ and the distribution of heart is not worse than 4-2, an extra chance, double squeeze, might exists. To be honest, no one will lead ♣ during a grand slam in the Youth Bridge Championship. Leading trump is always normal in a grand slam. Even if leading ♣, a finesse in ♡ still exists. So I do the same decision as my friend, bidding 7♠. The powerlessness I have never experienced comes. It is the first time for me to looking up to the ceiling and praying after laying the cards.

Partner's cards meet my expectations.
♠ AQ9532
♡ T43                     Lead: ♠4
♢ 8
♣ J74
----------------
♠ K6                     
♡ AKJ2                 
♢ AKQ2               
♣ A85 

How to play?
West wins with the ♠K in dummy as  South follows ♠8. After that, West takes the top one heart as North follows ♡8. It seems to be a singleton ♡8. Obviously, if ♡8 is singleton, 7♠ is an impossible contract. So West should take the top two hearts and the decide to play with double squeeze or play with 3 carda of heart with Q. So West continues to take the top heart. Unfortunately, North ruffs.
We lost 17 IMPs in this deal, 1 IMP in total in knockout tournament. No one knows bidding 4♠ is enough.

The full deal:
Board 13
Vul: Both
Dealer: North








Ridiculously, 7NT can be brought home by double squeeze in the case of not leading ♣. The declarer starts off three top ♢ as South discards ♡ on the third trick, indicating South holds long heart. That South holds more than 4 cards of ♡ is almost without doubt. So there is no way except double squeeze. ♡T automatically becomes the right threaten and ♣8 becomes common threaten. How nice it would be if I realize double squeeze is the only chance.

After competition, an experienced player told to me 5♢ wasn't a good bidding in this situation. There is little prospect that defenders hold ♠Q. In hence, there is no point to bid 5♢. If I were you, I would start to bid 6X and end with 6NT. Pass or 7♠ or 7NT should be decided by your partner.

Indeed, I didn't deal with well in the last stage of bidding. Anyway, regard is the most useless matter in the world.

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