1st 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 first winning exchange is to swap West's ♠9 for South's ♠10. The cost is (10-9)x2=2. The difference is doubled under Rule 2. South no longer has a tenace over West's ♠J, so the endplay described before fails.
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 first exchange, so it must either cost less than 2 (i.e., 1) or must involve lower cards or a lower suit than spades, under Rules 6 and 7. If you want a hint, look at Problem #129 in the archive. This is the problem that inspired Carlalberto Magri to compose this E&W problem. (It also happens to be the first problem I ever composed!)
© Hugh Darwen, 2001
Date last modified: 11 March, 2017