1C - 1H (spades)
2NT (4-5/3-6 16+) - 3H (5+ spades GF)
3S sets trumps - 4C cuebid
5D - 5H
5NT - 7S
North-south are i suppose you'd call them B list pros, but not a regular partnership, on a sponsored team. Out of curiosity what would be a B list pro get in an american tournament?
The bidding upto 4C is obvious to understand.
5D was meant as a void splinter, even though they'd agreed to play exclusion, on the basis that it wasn't bid directly. Logical or not?
5H would be 0/3 as a response to exclusion
if 5D was exclusion, 5NT would be a trump queen ask, but was intended as a temporising affair to check partner really did have the ace of clubs (assuming partner wouldn't cue a shortage but wondering if partner had subsequently shown 0 aces), thinking partner couldn't go overboard without the AKQ of trumps
7S was based on all the extra goodies he hadn't been able to show until now.

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