You probably don't need to understand your own bidding fully but to start 1C was 14+ clubs or 15+ balanced and 1H showed spades. East's 1D overcall was natural.
You're declarer in Fantoni's seat, North (sorry for keeping North declarer). West is Chip Martel and East is Lew Stansby. They play UDCA (and standard remainder count, but it doesn't come up here).
East leads the ♦K.
The play: (Always displayed in the order West North East South. The card led to the trick is underlined.)
W N E S
♦8 ♦A ♦K ♦2
♥7 ♥3 ♥A ♥K
♦9 ♦J ♦Q ♦4
♣2 ♠4 ♦10 ♦5
At this point Fantoni went into the tank. What's your plan now?

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