| 
    Equal Level Conversion Doubles - Normally when the overcaller makes a 
    takeout double, the doubler promises 3 or more cards in the unbid suits.  
    However when the partnership agree to play Equal Level Conversion Doubles (ELCD), 
    the doubler is allowed to have shortness in the Club suit - provided 
    the overcalling doubler has 5 Diamond.  This allows the doubler to 
    rebid Diamonds when partner (advancer) responds in the Club 
    suit - overcaller's short suit.  Playing normal takeout doubles, a new suit bid after a double 
    promises 18+ points and a self-sustaining suit.  The nomenclature 
    "Equal Level" is derived from the notion that the doubler is able to correct 
    advancer's Club response to Diamonds at the same bidding level. 
    Note - ELCD only applies when the overcaller doubles with shortness in 
    Clubs.  After overcaller's takeout double and advancer's bid in another 
    suit (other than Clubs), a new suit bid by the overcaller still promises a 
    very strong hand and a self-sustaining suit - strong suggesting a rebid by 
    the advancer. 
      
        | Bidding | Meaning |  
        | (1H) - X - (P) - 2C;(P)   - 2D
 | Classic Equal Level 
        Conversion Double, overcaller holds:- 12+ distribution points
 - 4 cards in the unbid major (Spades)
 - 5 Diamonds
 - Shortness in Clubs
 S  
        A K 3 2H  4 3 2
 D  A J 10 3 2
 C  2
 
 |  
        | (1S) - X - (P) - 2C;(P)   - 2D
 | Another typical  Equal 
        Level Conversion Double, overcaller holds:- 12+ distribution points
 - 4 cards in the unbid major (Hearts)
 - 5 Diamonds
 - Shortness in Clubs
 S  
        4 3 2H  A K 3 2
 D  A J 10 3 2
 C  2
 
 |  
        | (1S) - X - (P) - 2D;(P)   - 2H
 | Overcaller holds a power 
        hand with 18+ points and a self-sustaining suit with strong interest in 
        game: S  2H  A K Q J 3 2
 D  A K J 4
 C  Q 2
 
 |  
        |  |  |  Equal Level 
    Conversion Doubles was created by Robert Ewen, described on page 25 in
    
    Doubles For Takeout, Penalties, and Profit in Contract Bridge.  Also see 
    Takeout Doubles,
    Doubles and books on 
    Doubles |