Double Dummy Corner

 

3rd exchange for Exchange & Win No. 17

♠ A2

 AJ10

 Q1073

♣ J762

♠ J10873

 KQ2

 98

♣ 954




♠ K

 9876543

 KJ4

♣ Q3

♠ Q9654

 none

 A652

♣ AK108

South is declarer in five no-trumps.  What is the winning exchange?

What sequence of counter-exchanges follows?

The third winning exchange is to swap North's 4 for East's 3.  The cost is (4-3)x2=2, as for the first exchange, but the sum of the pip values is only 7 instead of 19. Now the seesaw squeeze is not available, because North cannot play under the 4 in the endgame, allowing West to safely unguard spades.

North-South is now the losing side and we must find a counter-exchange that makes them the winning side again.  The counter-exchange must be cheaper than the third exchange, so it must either cost less than 2 (i.e., 1) or must involve lower cards or a lower suit than diamonds, under Rules 6 and 7.

E&W #17 Problem #129 4th exchange revealed  
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        Hugh Darwen, 2001

Date last modified: 11 March, 2017