Unusual 2NT Examples

Board 6
East Deals
E-W Vul
♠10 7 6 4 2
♥K Q 10 3 2
♦A 5
♣K
♠Q J 3
♥8 5 4
♦Q J 10 7 2
♣A 9
N
WE
S
♠K 8 5
♥A 6
♦K 6
♣Q J 10 7 4 2
♠A 9
♥J 9 7
♦9 8 4 3
♣8 6 5 3

WestNorthEastSouth
  1♣1Pass
1♦22NT!33♣3♥
All pass4   
  1. East will open 1♣
  2. West will bid 1♦
  3. North will bid 2NT for the majors
  4. A double would do just as well in this situation, but the bid of 2NT takes out bidding space.
3♥ by South