You are playing an Individual at your club's Christmas party, with aggregate scoring. There is a tendency for players to take these events less seriously, but this can be shown to be based on false logic: there are real (alcoholic) prizes for winning the Christmas Bridge session. All you get for winning a normal session is a few pointless master points. The true connoisseur knows that we are now faced with a crucial decision in a strange auction!
Bid or pass?
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I rank
1. 4♥ = CUE (or NAT)
2. 4♠ = NAT 4♣ must show a ♠ fit.
3. Pass = NAT. Partner might assume you have some ♣s so this might be a disaster.
He probably has something like ♠ A K J x x ♥ x x ♦ - ♣ K Q x x x x x
And your RHO has the remaining ♣s
4. Pass slowly would probably work but might not be an ethical option.