Given a chance …
LHO leads the ♦ Ace, and you see your own meager assets:
At trick 2 LHO plays back a small heart. You win perforce and pull ♠ K, LHO winning the ace and returning a diamond to dummy’s king and RHO’s Jack.
The hand is virtually double dummy – LHO must have 2155, he’s already produced ♠ A and ♦ AQ, so need not – but can have ♣ K.
Do you see a possibility?
If ♣ K is with RHO, there’s no way you can get your 10 tricks – but if LHO has it..
So you cash the ♠ T and then carefully cash your heart winners to force some discards from LHO before playing a spade to Q.
LHO discards two clubs and one diamond, and now he’s down to three clubs and 2 diamonds.
On the last trump he’s forced to let go a diamond to keep the clubs guarded, and you finally recognize the most powerful card you’ve been dealt – the ♣ 9. You discard the ♣ Q from dummy and play the ♣ 9, LHO can’t afford to cover, and now you are able to play small, and play a diamond for a stepping stone throw in to boost you to dummy’s club winners.
Yes, the defense lost its way a couple of times – the lead of ♦ A for example, a simple ♥ lead will leave you with no play. A club switch when in with ♠ A will also defeat you.
But bridge, and life, is making the most of 2nd chances.
If West is 2-1-5-5, it does not matter who has the CK, when he returns a D to the King on the table. You can cross to the SQ, and run the C9. If East has the King, the club winners can be rammed through him as trump substitutes. If the C9 wins, you have 6 winners outside trumps, and they cannot prevent you from ruffing the 4th H on the table with the 10, and score your little trump en passant — after C9 wins, cross to cash H winners, CA, and play C ruff over ruff, ruff H, club again so that their trump and D tricks clash.