Bridge Quiz 43-1
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NS Vulnerable North
 
 
West
♠  K Q 10 9 4
♥  9 5
♦  7 2
♣  A J 10 6
  East
♠  A
♥  A K Q 10 8 6
♦  A J 10
♣  K 8 7
South
 
 

W N E S
  Pass 2♣ -
2♠   - ?  

With 22+ points and/or 4 losers or less always open with the forcing to Game Convention bid of 2♣.
The Conventional negative response is 2♦, showing 0-7 points and a virtual sign that Slam is most unlikely and Opener must contend himself with a Game score contract.

In this case however West made a positive response of 2♠, which shows 8+ points and a 5+card spade suit. It is also an immediate sign that Opener should aim for a Slam.
So what does East bid next ?