[cphastrup]

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IMPs across the (intermediate) field.
We as N/S didn't really get into heated arguments and mostly blamed West's gutsy (!) overcall. Would you have done anything differently?

[Cyberyeti]

Well I'd double 4♠ but we're not getting desperately rich out of that, the problem is that visualising the spade void in the south hand holding only 2 yourself isn't easy, and there must be a danger partner has two small spades and a club loser.

[the_dude]

As for South, if you open 4♣ with >50% of your HCP outside of your suit, you can be sure that sometimes your partner will misjudge the auction. I might open 4♣ anyway but that's the risk you take.

As for North, there are many hands that will make 5♣ (AK-8th and out, virtually any singleton spade) and many hands where the opponents are making 4♠. Give West one more ♦ and one less ♥ and both contracts are making.

At IMPS, bidding on is right if either contract is making .. and you really don't want to risk a double game swing if both contracts are making .. so I give most of the blame to North.

[HeartA]

North's pass was a crime. Either 5♣ or double is acceptable.

[Free]

I don't think opening 4♣ is wrong. Passing 4♠ however is nuts. Both Dbl and 5♣ would be ok imo.