Nobody vulnerable; LHO deals and passes; your partner opens 2C, and you are off to the races (the auction at my table was 2C-2D, 2S-2NT, 3H-6NT, but other auctions are possible) and here you are declaring 6NT.
AKQ43
AK87
T
AQJ
2
QT5
AJ962
K876
Opening lead is the 4 clubs. All you have to do now is make it. What's your best chance?
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Okay, I looked a few (maybe more than a few!) scenarios.
Best line seems to be win A clubs in dummy (note whether RHO sheds 9/T)
and then A of spades followed by ducking a spade pitching a diamond. When
you get in with a club (defence probably won't open up another suit), cash
top spades whether they break or not; if spades break, claim.
If the spades don't break 4-3, when LHO has length, he's likely to have five
or fewer red cards in which case the finesse in hearts is better (cash A H and
intend to finesse T H). When RHO has length, atakdog's post pretty much
sums it up. In some cases, RHO has to protect hearts OR something like both
diamond honors so he'll get squeezed when you cash out. If there isn't a
likely squeeze, your play on hearts is Ah and lead to the queen of hearts,
intending to play for 3-3 hearts or the fall of the jack.
Also, if you find LHO has exactly 6 red cards, even though the finesse is
about 55% (cashing out Ah in dummy first and includes finding a stiff 9h in
RHO), it's better to play for hearts 3-3 or the drop of the jack in the first two
rounds (59%).
From the carding on the second round of clubs, you almost have a count of
both black suits and thereby figure out your play on the heart suit, so there's
no need to cash out clubs in dummy; besides, you sometimes need an entry
to dummy outside of hearts (e.g., when RHO has stiff 9 H).
Sorry to say, I haven't picked up a bridge hand or book in a few years!