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    Trump Suit Preference - An alternative use of 
        carding when declarer begins playing trump, allowing defenders to show 
        suit preference.   When the defender can afford to play either 
        of two trump cards held, first discarding the higher card as part of a 
        high-low echo shows interest in the higher ranking suit while playing a 
        low-high echo indicates a desire to play the lower ranking suit. 
      
        |  |  Q 6 5 
  9 8 7 
  8 
  Q J 10 9 
        8 7 |  |  
        |  8 3 
  K Q 2 
  A 4 3 2 
  6 5 4 3 | N    -    E    -    
        S    -    W
 1S   -   P    -   2S
 3D  -    P    -    
        P    -   4S
 |  K 7 2 
  A J 10 4 
        3 
  Q J 6 4 
  2 |  
        |  |  A J 10 9 
        4 
  6 5 
  K 10 8 7 
  A K |  |                 
    1S P - 2S - P 
    - 3D P - 4S From the 
    bidding and viewing the dummy, apparently declarer's trump is a 5-3 split.  
    The defenders wins the first and second Heart tricks, with declarer ruffing 
    the third trick.  After the declarer ruffs the third Heart, declarer proceeds playing the 
         A, West playing 
    an  8 while East plays the  2.  The declarer then leads 
    the  10 (unblocking), with East 
    winning the  K and West follows with the  3. Based on 
    West's high-low trump  play on the prior tricks, West is asking for a Diamond switch.  
    So while East would like to lead the singleton Club, East should instead return a 
    Diamond.  
    Otherwise, declarer wins the Club, pulls trump, wins 4 more rounds of Clubs, 
    pitching two Diamonds to make the contract.  Note - a clever East might 
    risk ducking declarer's second trump ( 10), 
    winning the  K on 
    the third trick; this hold-up severs declarer's transportation to dummy's 
    promoted Club suit. 
 Also see 
    Details on signaling and books on
     
    Signals
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