Cross IMPs, all vulnerable, bidding goes :
1♠ - 1NT - 2NT .
The opening pair plays 2/1, nothing fancy. The 1NT overcall was 15-17, with stop(s) in ♠.
This is the first time that such a sequence came around for the opening pair, never discussed before.
What sort of hand has the 2NT bidder ?
Benefits include:
Plus... it's free!