I like these problems, because there is a lot we can infer to guide us, yet at the end we have to make some judgment call.
For example, we can infer that declarer is 2=2 majors, else partner would have expressed a preference for a major.
We can infer that declarer has good diamonds, but we can't be sure how good or even how long. He is either 2=2=6=3 or 2=2=5=4.
I started writing a long analysis, but the truth is that I was spending more time writing than I was thinking, and I can't come to a clearly 'right' line of defence.
I am NOT going to play partner for the club K. Yes, that may be the only winning defence, but that assumes that the contract is cold unless we take our 4 tricks right away. That seems pessimistic to me: why play opener for the equivalent of Jx Kx AKQJxx xxx rather than Jx xx AKQJxx Kxx?
While we need to play clubs now on the first hand, it simply hands over an impossible contract on the other (assuming we pitch correctly).
Me? I was thinking of ducking the second spade, but on reflection doubt that it matters. I am going to get squeezed, if a squeeze is there, in any event (as best as I can see).
So I am intending to win, to clear spades and, if the diamonds appear to be such that declarer has exactly 5 winners, I will pitch hearts (after my low club) playing partner (who is, I infer, 3=3 majors) to hold the 10 (or the King, but if he holds the King declarer is going to be dead...especially since I will be stripping partner's spade exit at trick 3, so even the most comatose partner will lead a club to my AQ)
I'm hoping for Jx Kx AKQ108 Kxxx
If it was Jx Kx AKQJxx xxx or equivalent: this wasn't the last game I let through on a guess, and I can always blame partner for not switching to a low club (just kidding!).
Btw, I somewhat discount the possibility of opener being 3=3 majors: on this auction, I'd expect Zia to smell blood with 3=3=5=2 and hammer 2S. Also, I am not playing for diamonds to be 1=2=4=6 around the table, since the suit rarely contains 14 cards
'one of the great markers of the advance of human kindness is the howls you will hear from the Men of God' Johann Hari
Lamford writes 'This was an unusual push in the Palace Cup in Warsaw, a short time ago. You lead the three of spades (attitude) against 3NT. Zia plays low and partner plays the queen and returns the ten of spades to South's jack, your ace and dummy's eight. What now? In the other room, after the same start, Nowosadski bid 3NT as North instead of doubling 2♣. The play to the first two tricks is the same, with Kalita at the helm. What now?'
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I declarer is 3-3 in the majors or if the layout is like that on the left and LHO plays a 3rd ♠,
then LHO might have to throw 2 ♣s, to guard ♥s