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| style="background:#ffcc00;" |  <center> <big> <big> ''' The Overall Design Principles of Simplex ''' </big> </big> </center>
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* <big> ''PRINCIPLE 4:'' '''There is no difference in the requirements for opening bids and overcalls.  They share the same point-count range and the same suit-length requirements.''' </big>
* <big> ''PRINCIPLE 9:'' '''Simplex is a fundamentally natural bidding system. The only gadgets used are 2{{Cs}} Redshift, 4NT Blackwood, and 2NT.''' </big>
* <big> ''PRINCIPLE 10'': '''Hands with trump support but less than 10 HCP bid immediately to their total trump level.''' </big>
** For example, after a 1{{Hs}} opening by partner, a hand containing 6 HCP and four cards in the heart suit would immediately raise to 3{{Hs}}. (Partner is known to have at least five hearts.  Add those five to the four that responder has makes nine.  Take six from nine means a raise to the 3-level.)
* <big> ''PRINCIPLE 11'': '''If a bidder cannot make the first-round bid his hand merits (because the opposition have already taken the auction too high), the bidder simply doubles, with an implied message to partner: "RHO has just taken my opening bid away, and I believe it is safe for you to bid at this or one level higher." </big>
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* <big>  ''PRINCIPLE 24'': ''' Apart from the use of double, Simplex never keys its bids off the opponents' bidding.   ''' (There is, for example, no concept of a jump overcall relative to an opponent's bid.  And a bid of the 'enemy suit' is always natural, showing at least three cards in that suit.)   </big> 
** <big> The philosophy of Simplex is that each hand is worth a particular bid, or sequence of bids, and if one of those bids cannot be made because of opposition bidding, the appropriate bid is usually to double. </big> 
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