Competition Problem 143b
South to make four spades. West leads the ♥Q.
Successful solvers: Ian Budden, Leigh Matheson, Radu Mihai, Sebastian Nowacki, Zoran Sibinović, Rajeswar Tewari, Andries van der Vegt, Dick Yuen, Wim van der Zijden Tables
I hoped nobody would notice this problem's resemblance to Competition Problem 118b, from December 2014, but at least two solvers did. Apologies to them.
After the ♥A at trick one South must immediately ruff a heart and then lose a spade to West’s ♠K. South ruffs the heart return, cashes the ♠A (optionally—this can be done later) and advances the ♦Q. Assuming West wins with the ♦K and returns a diamond, the following ending is reached with South on lead:
A spade to the ♠Q wrings the ♥10 from West (if a club, then ♣A and another establishes the suit), whereupon ♦9 and another diamond throws that player in for a lead away from the ♣K.
Note: If West returns a heart instead of a diamond, this must be ruffed by South, not North.
See the solution to Competition Problem #4 for the recommended tabular format if you prefer not to write in English prose.
Hugh Darwen, 2017