2nd exchange for Exchange & Win No. 17
South is declarer in five no-trumps. What is the winning exchange?
What sequence of counter-exchanges follows?
The second winning exchange is to swap North's ♥9 for East's ♥10. The cost is (10-9)x2=2, as for the first exchange, but hearts are lower than spades. This exchange means that after a spade, four rounds of clubs and two of diamonds, East is on lead (if diamonds have been played carefully) with just hearts and the ♦3 remaining. A heart lead lets North establish a heart trick with a diamond entry, so East leads the diamond. South plays the carefully preserved ♦2 and West is subjected to a seesaw squeeze, North playing high or low according to West's discard.
East-West 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 second exchange, so it must either cost less than 2 (i.e., 1) or must involve lower cards or a lower suit than hearts, under Rules 6 and 7.
© Hugh Darwen, 2001
Date last modified: 11 March, 2017