Competition Problem 110b
South to make six spades. West leads the ♦Q.
Successful solvers: Jean-Marc Bihl, Steve Bloom, Ian Budden, Bülent İyidoğan, Radu Mihai, Sebastian Nowacki, F.Y. Sing, Dick Yuen, Wim van der Zijden Tables
Declarer wins in hand with the ♦A, cashes the ♥A, then leads the ♣Q, covered by the ♣K and ♣A. North leads the ♠10, which East does best to duck. South unblocks the ♠8 so that North remains on lead when East then ducks the ♠7. South now ruffs a heart, cashes the ♠A and ♣J, then exits to East on the third club, giving this four card ending with East on lead:
A heart lead gives declarer a heart trick. A club lead is ruffed by North, squeezing West: a diamond discard is followed by the ♦K, a heart ruff and a good diamond, whereas a heart discard lets North establish the ♥7 by leading the ♥Q, with the ♦K for re-entry.
See the solution to Competition Problem #4 for the recommended tabular format if you prefer not to write in English prose.
Hugh Darwen, 2014