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Slams  Extension

These are advanced topics, for intermediate and higher level regular partnerships
After a 5C or 5D response to 4NT, when you want to locate the whereabouts of the trump queen. Used  mainly when a small slam looks certain and you will bid a grand slam if partner has the queen. 
After Stayman or Transfers, 4NT is a quantitative slam try, because no suit has been agreed. 2NT-3C-3H -4NT does not agree hearts - it may be that responder has four spades and was hoping for a spade fit. 2NT-3H-3S-4NT does not agree spades - opener may have only two spades and responder five spades. Responder needs alternative slam investigative tools. 
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