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[Event "Dubious Grand Slam, June 6, 2017 -- Problem"]
[Site ""]
[Date ""]
[Board "16"]
[West ""]
[North ""]
[East ""]
[South ""]
[Dealer "W"]
[Vulnerable "EW"]
[Deal "W:QT87.Q854.93.Q53 6.A9732.AQJ82.AJ 932.T.T654.T8642 AKJ54.KJ6.K7.K97"]
[Scoring ""]
[Declarer "S"]
[Contract "7NT"]
[Result ""]
{

After an auction best forgotten, you land in 7NT.  Plan the play on

(a) the correct lead of the \D9, and

(b) the actual lead of the \S7.}
[BCFlags "1f"]
[Hidden "EW"]

[Event "Dubious Grand Slam, June 6, 2017 -- Solution"]
[Site ""]
[Date ""]
[Board "16"]
[West ""]
[North ""]
[East ""]
[South ""]
[Dealer "W"]
[Vulnerable "EW"]
[Deal "W:QT87.Q854.93.Q53 6.A9732.AQJ82.AJ 932.T.T654.T8642 AKJ54.KJ6.K7.K97"]
[Scoring ""]
[Declarer "S"]
[Contract "7NT"]
[Result ""]
{When the opponents bid to 7NT and you hold three queens, partner probably does
not have as much as a jack.  Lead the fourth suit; the \D9 is correct, but a
sneaky \D3 would be fine.  With a diamond lead, declarer should try to bring in
the heart suit.  You can do this if East has the\HQ with no more than three
cards.  A singleton \HQ with West won't help, but if East has a singleton \HQ,
you must lead low toward the \HK first.  When East plays the \H10 on the first
round, declarer has an alternative to finessing:  rise with the K and lead the
\HJ for the first of two finesses -- not likely, as the \H10 could be East's
play from \HQ10 or \HQ10x. 

West's actual lead of the \S7 was helpful, bringing my trick total up to
twelve.  An excellent approach is to combine chances:  play the \HAK, and if
her majesty has not appeared, take the club finesse.  When that wins, it's not
hard to untangle three spades, two hearts, five diamonds, and three clubs:  13
tricks.

However, I'm an inveterate squeezer.  I won East's nine with the \SJ, took
three diamonds to assure they split and discard the \S4 (West, under pressure,
discarded the \C3).  Next the \CK and the \SAK, discarding two hearts from
dummy, with both opponents following.  On the lead to the \CA, West discarded a
heart.  

A classic double squeeze position had been established, but I did need to read
the situation correctly; I played East for the club guard.  The suit in which
both opponents would be squeezed is hearts (even though only one could actually
guard that suit).  With no winners left in either of the black suits, two
winners were required in hearts for the squeeze to function properly; those
honors are the entries.  With East clutching the \C10 for dear life, this was
the end position.\n
                \S -\n
                \H A 9 7\n
                \D J 8\n
                \C -\n
\S Q\n
\H Q 8 5 4\n
\D -\n
\C -\n
                \S 5\n
                \H K J 6\n
                \D -\n
                \C 9\n
On the \DJ, I pitched a heart, and West also could afford a heart. After the
last diamond, East still had his \C10 and thus could not hold three hearts.  I
let go the \C9, whose job was done.  West eventually tried discarding the \SQ. 
I cashed the \HAK, and the \S5 made 13 tricks.\n
                                                                               
                       -- <i>Pete Matthews</i>
}
[BCFlags "1f"]