Larry's Bidding

Bidding with Larry!
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Hand #1127

You are South. 
South deals, NS vul, IMPs

♠ AQ108764  
♥ AQ10  
♦ -  
♣ Q72
 

What is your call on the auction below: 

WestNorthEastSouth
       1♠
 2♠  2♠  Pass  ?


Your Choice:

2♠

3♠

3♠

3♠

4♠

4♠/Other