Double Dummy Corner

Competition Problem 39

composed by Hugh Darwen

presented for solving in May, 2008

 DR6 ♠ AQ1098 ♥ Q98 ♦ A8 ♣ 3 ♠ J76 ♥ K ♦ J1092 ♣ 987 ♠ 543 ♥ AJ10 ♦ K65 ♣ QJ ♠ K ♥ 765 ♦ Q743 ♣ K102

East is on lead at no-trumps.  North-South to make 7 tricks.
How do East-West make 5 tricks if the
8 and 6 are interchanged?

Successful solvers:  Steve Bloom, Rajeswar Tewari (both of whom suggested DR6).

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Solution

A.      If East leads the K, West plays high and North wins.  Two rounds of clubs follow, setting up the 10.  North discards a heart or a diamond.  East does best to return a low heart to West, who exits on a spade.  North must rise with the A and play two more rounds of spades, South discarding hearts.  West exits on a club but is put back on play with a diamond and has to lead into South's diamond tenace.

(a)      If East returns a low heart to West, who exits on a spade, North must rise with the A and play two more rounds of spades, South discarding hearts.  West exits on a club but is put back on play with a diamond and has to lead into South's diamond tenace.

(b)     If East returns a spade, North wins with the A, cashes the Q, and exits on a heart.  East must allow this to run to West's K, effectively transposing to line (a).  Trap: If North exits on a spade instead of a heart, South's forced heart discards allow East to overtake West's K and lead a diamond.

B.      If East leads a heart, West must return a diamond.  North plays low and East wins to return the suit.  South comes to hand on a club and cashes the Q, North discarding a spade.

(a)      If West has played the 2, South exits on a low club, wins the spade return, cashes the 10, and throws West in with a diamond.  North discards hearts and makes two spade tricks.

(b)     If West's last diamond is the 2, South exits on the 10, wins the spade return, cashes the 7, and throws West in with a club, with the same effect as in (a).

If the 8 and 6 are interchanged, East leads the K.  The ending of line A no longer works.

See the solution to Competition Problem #4 for the recommended tabular format if you prefer not to write in English prose.

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