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Subj:   Bridge Challenge #1 (S505c)
        From Chapter 3 - "Let Me Play the No-Trumps, Dear", page 30

From the book Winning Declarer Play 
              by Dorothy Truscott 
              Published in 1969 by Harper and Row
 
North
S - A Q 8 7 6 5 
H - J 2
D - 6 4 2
C - 6 5

South
S - 4
H - A K Q 10 9
D - A J 10
C - A K Q J


The contract is 6 No-Trump in the south and the opening lead is the ten of Clubs.

You can count eleven tricks off the top - five hearts, four clubs, and the other two aces.  There are two prospects of a twelfth trick.  You can finesse the queen of spades, or you can take two finesses in diamonds.  Which line of play gives you the best
chance of making this contract?

 

The right play is to take two diamond finesses.  There are four material diamond situations that can exist.  West can have: (1) the diamond king,
(2) the diamond queen, (3) both, or (4) neither.  In only one of these situations, number 3, will you be defeated by taking two diamond finesses.
In the other three situations you'll wind up taking two diamond tricks and
making your contract.  Thus, the chances of success are about three our of
four.

The chance of the spade finesse working is of cource, only even money, or
50 percent.  A play that succeeds about three times out of four is much
better than one that succeeds only half the time, so the diamond suit is
clearly the one to tackle.

The best line of play is thus the following:

Win the club lead in your hand and enter dummy with the heart jack to take
one diamond finesse.  If this loses, you will eventually return to dummy
with the spade ace to take another diamond finesse.
 

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This is one example from Dorthy Truscott's book "Winning Declarer Play."  Buy the book, read it, and rereat it a dozen times.  I guarantee it will improve your bridge game.

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