[Bbradley62]

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We must be playing some sort of convention over interference that has become popular in the past 20 years, because I have no idea what was going on.

• Does 3♥ not say anything about hearts?
  
• Since 3♥ shows 2+ of each minor, would other bids have shown shortness?
  
• Over 3♥, explanations of 3♠ or 4♠ by me appeared to be identical. Is there a distinction?
  
• Why did North deny ♣A?

PS: Please get rid of the unnecessary verbiage saying "notrump opener" -- it's perfectly clear that no trump has been opened.

[Stephen Tu]

Yes, 3 other major agrees opener's major and is a slam try. 4c/4d are splinters. This is one common method of slam bidding over a major. The other uses 3OM as "some splinter" and 4c/4d as RKC/bal slam try with fit.

3s/4s -- probably opener should never bid 4s IMO, but it has to define it in case some person bids it not knowing what's going on. Who knows why it didn't bother showing the club ace.