The bidding went 2♣ - 2♥ (7-9 HCP) - 3NT.
The scoring was IMP. I was seriously thinking if I should bid 5♣ over 3NT but didn't do so, and we ended up 3NT+3, while everyone else bid a slam (although one table gone 7♣-1).
If I bid 5♣ the opener would have gone 6.
If the opener first rebid was 2NT I would have gone 3NT because our system doesn't have a mechanism to show a long minor after a 2NT opening.
How would you have bid slam on this hand?