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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 2
H  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 2
H  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  2
H  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

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