IMP scored club game. Table result 3♠X-1 by East, NS+100
NS open shapely hands fairly light and especially so in 3rd seat, and are playing inverted minors (in and out of competition). The 3♦ bid was alerted, and East enquired. North said it was "weak".
After being doubled and before the lead, declarer commented that "it didn't sound that weak". North commented, "I didn't say it didn't have spades".
At the conclusion of the hand it transpired that NS were the only pair to be plus and East said she "wouldn't have bid 3♠ had I known it (South) could have been that strong".
Other pairs (in diamonds) made 9 tricks in diamonds (though they were all at the 4 level).
EW are an average club pair who do not themselves play inverted minors, and inverted minors is not the norm at this particular club - though NS have been playing this way there for years and one or two other pairs also play inverted minors.
North was, in fact the director for the session and referred this to a less experienced club director after the session - who suggested that it "should be an average" - but that isn't a legal ruling as far as I am aware.
How do you rule? Is describing the 3♦ bid as "weak" MI? If so, rolling the hand back to 3♦ making actually worsens the result for EW!
I would appreciate a more learned and independent comment. Thanks for your time.
Nick