This particular defense method is only for the more advanced player and more experienced partnership owing to its complexity. The summary is presented on this site with no examples or illustrations. The summary is compiled by Mr. Mohamed Abdel Bari and has been contributed by Mr. Scott Bennett Graham. The definition of the designation remains unknown.

This conventional defense method is divided into five separate sections to include all possible overcalls from 2 Clubs to and including 2 No Trump by the immediate player next in rotation following the 1 No Trump opening bid by the opposing side.

1.	An immediate overcall of double shows either a one-suited holding with Hearts only (usually a 6-card suit), or a holding with a 5-card plus Heart suit and a 5-card plus unspecified Minor suit.
	Assuming that the responder of the 1 No Trump opener does not compete, then the advancer can communicate information in the following manner.
	Advancer
	Pass:	Suitable for defense.
	2 :	Takeout; not suitable for defense; no Heart fit.
		Note: Assuming that the responder of the 1 No Trump opener does not compete, then the overcaller can continue to compete on the two / three level with the following rebids to describe accurately the holding. This principle remains in effect for all following overcalls and responses by the advancer.
		Pass:	with 5 Clubs and 5 Hearts.
		2 :	with 5 Diamonds and 5 Hearts.
		2 :	with only a Heat suit.
		2 :	shows a strong hand with 5 Hearts and 5 of a Minor suit; advancer bids 2 No Trump, and now doubler shows his Minor suit.
		2 NT:	shows a strong hand with 5 Hearts and 6 Clubs or 6 Diamonds (over which 3 Clubs is to pass or correct).
		3 :	shows a strong hand with 6 Hearts and 5 Clubs.
		3 :	shows a strong hand with 6 Hearts and 5 Diamonds.
		3 :	shows a strong hand with only a Heart suit.
	2 :	A natural bid promising at least a 6-card Diamond holding; no Heart fit, and still not suitable for defense.
		Continuations by the overcaller following the 2 Diamonds response by the advancer.
		Pass:	Shows at least 2 cards in Diamonds.
		2 :	Shows only a Heart suit and fewer than 2 Diamonds.
		2 :	Shows a strong hand with 5 Hearts and 5 Clubs; responder gives preference.
		2 NT:	Shows a strong hand with 5 Hearts and 6 Clubs.
		3 :	Shows a strong hand with 6 Hearts and 5 Clubs.
		3 :	Shows a strong hand with 6 Hearts and 3 Diamonds.
		3 :	Shows only a strong hand containing Hearts.
	2 :	Shows at least a 3-card Heart fit; still not suitable for defense.
		Continuations by the overcaller following the 2 Hearts response by the advancer.
		2 :	Shows a strong hand with 5 Hearts and 5 of an unspecified Minor suit; advancer bids 2 No Trump with no Heart support in order to discover the unspecified Minor suit.
		2 NT:	Shows a strong hand with 5 Hearts and 6 Clubs / Diamonds; 3 Clubs asks, 3 Diamonds shows Diamonds, and 3 Hearts shows Clubs.
		3 :	Shows a strong hand with 6 Hearts and 5 Clubs.
		3 :	Shows a strong hand with 6 Hearts and 5 Clubs.
		3 :	Shows a strong hand with only a Heart suit; invites game.
	2 :	Promises at least a 3-card support for Hearts; game forcing. (*Maybe better not leave double in.)
		Continuations by the overcaller following the 2 Spades response by the advancer.
		2 NT:	Shows 5 Hearts and 5 plus Clubs / Diamonds. (3 Clubs asks; 3 Diamonds shows Diamonds; and 3 Hearts shows Clubs.)
		3 :	Shows 6 Hearts and 5 Clubs.
		3 :	Shows 6 Hearts and 5 Diamonds.
		3 :	Shows only Hearts.
	3 :	Preemptive; shows a 4-card Heart suit.
2.	An immediate overcall of 2 Clubs shows either a one-suited hand with Spades only (usually a 6-card suit), or 5 plus Spades and a 5 plus unspecified Minor suit.
	Responses by the advancer if the responder to the 1 No Trump opener passes or does not interfere with the partnership playing systems on.
	2 :	Takeout, and no Spade fit.
		Continuations by the overcaller following the 2 Diamonds response by the advancer.
		Pass:	Shows 5 Diamonds and 5 Spades.
		2 :	Shows a strong hand with 5 Spades and a 5-card unspecified Minor suit. (3 Clubs by the advancer is to pass or correct).
		2 :	Shows a one-suited hand with Spades.
		2 NT:	Shows a strong hand with 5 Spades and 6 Clubs / Diamonds (over which 3 Clubs is to pass or correct).
		3 :	Shows 5 Clubs and 5 Spades.
		3 :	Shows a strong hand with 6 Spades and 5 Diamonds.
		3 :	Shows a hand with 6 Spades and 5 Clubs.
		3 :	Shows a strong hand with a one-suiter in Spades.
	2 :	This response is natural showing at least a 6-card Heart suit, no Spade fit.
		Continuations by the overcaller following the 2 Hearts response by the advancer.
		Pass:	Shows at least 2 cards in Hearts.
		2 :	Shows only the Spade suit and fewer than 2 Hearts.
		2 NT:	Shows a strong hand with 5 Spades and 5 plus Clubs / Diamonds, over which 3 Clubs is to pass or correct.
		3 :	Shows a strong hand with 6 Spades and 5 Clubs.
		3 :	Shows a strong hand with 6 Spades and 5 Diamonds.
		3 :	Shows a strong hand with 6 Spades and 3 Hearts.
		3 :	Shows a strong hand with only the Spade suit.
	2 :	This response shows a Spade fit with at least a 3-card Spade suit.
		Continuations by the overcaller following the 2 Spades response by the advancer.
		2 NT:	Shows a strong hand with 5 Spades and 5 plus Clubs.
		3 :	Shows a strong hand with 6 Spades and 5 Clubs.
		3 :	Shows a strong hand with 6 Spades and 5 Diamonds
		3 :	Shows a strong hand with 5 Spades and 5 plus Diamonds.
		3 :	Shows a strong hand with only Spade suit; invites game.
	2 NT:	Shows a Spade fit with at least 3-card support. Game forcing.
		Continuations by the overcaller following the 2 No Trump response by the advancer.
		3 :	Shows 5 Spades and 5 plus Clubs.
		3 :	Shows 5 Hearts and 5 plus Diamonds.
		3 :	Shows 6 Spades and 5 Clubs / Diamonds. (3 Spades asks; 3 No Trump shows Diamonds; 4 Clubs shows Clubs.
		3 :	Shows a strong hand with only the Spade suit.
	3 :	Preemptive, promising at least 4 Spades.
3.	An immediate overcall of 2 Diamonds promises both Hearts and Spades and at least 5 plus cards in both suits.
	Responses by the advancer if the responder to the 1 No Trump opener passes or does not interfere with the partnership playing systems on.
	2 :	Shows preference for Hearts.
	2 :	Shows preference for Spades.
	2 NT:	Game forcing and simultaneously asks for short suit.
		Continuations by the overcaller following the 2 No Trump response by the advancer.
		3 :	Shows 5-5-2-1 shape.
		3 :	Shows 5-5-1-2 shape.
		3 :	Shows 5-5-3-0 shape.
		3 :	Shows 5-5-0-3 shape.
		3 NT:	Shows 6-5-1-1 or 5-6-1-1 shape. (4 Clubs asks; 4 Diamonds shows 6 Hearts; 4 Hearts shows 6 Spades.
		4 :	Shows 5-6-2-0 shape.
		4 :	Shows 6-5-2-0 shape.
		4 :	Shows 5-6-0-2 shape.
		4 :	Shows 6-5-0-2 shape.
	3 :	Similar to a trial bid, asking partner (overcaller) to bid 4 Hearts with shortage in Clubs, or to bid 3 Hearts with 2 or 3 cards in Clubs.
	3 :	Similar to a trial bid, asking partner (overcaller) to bid 4 Hearts with shortage in Diamonds, or to bid 3 Hearts with 2 or 3 cards in Diamonds.
	3 :	Preemptive. Partner (overcaller) can continue to game in Hearts.
	3 :	Preemptive. Partner (overcaller) can continue to game in Spades.
4.	An immediate overcall of 2 Hearts shows exactly 4 Hearts and a longer unspecified Minor suit generally of 6-card length.
	An immediate overcall of 2 Spades shows exactly 4 Spades and a longer unspecified Minor suit generally of 6-card length.
	Responses by the advancer if the responder to the 1 No Trump opener passes or does not interfere with the partnership playing systems on.
	Pass:	Obvious.
	2 NT:	Game forcing and asks partner (overcaller) to bid his suit.
	3 :	Shows no Major suit fit; asks partner (overcaller) to pass or correct. If partner (overcaller) is strong, then he can bid 4 Clubs and/or 4 Diamonds.
	4 :	To play.
	4 :	To play
5.	An immediate overcall of 2 No Trump shows both Minor suit with at least 5-5 distribution.
	Responses by the advancer if the responder to the 1 No Trump opener passes or does not interfere with the partnership playing systems on.
	3 :	Preference to Clubs. Overcall can continue to cuebid with a strong hand.
	3 :	Preference to Diamonds. Overcall can continue to cuebid with a strong hand.
	3 :	Asks overcall to bid 5 Clubs with shortage in Hearts, else bid 4 Clubs.
	3 :	Asks overcall to bid 5 Clubs with shortage in Spades, else bid 4 Clubs.
	4 :	Roman Keycard Blackwood for the agreed trump suit Clubs.
	4 :	Roman Keycard Blackwood for the agreed trump suit Diamonds.
	5 :	To play.
	5 :	To play

 

If you wish to include this feature, or any other feature, of the game of bridge in your partnership agreement, then please make certain that the concept is understood by both partners. Be aware whether or not the feature is alertable or not and whether an announcement should or must be made. Check with the governing body and/or the bridge district and/or the bridge unit prior to the game to establish the guidelines applied. Please include the particular feature on your convention card in order that your opponents are also aware of this feature during the bidding process, since this information must be made known to them according to the Laws of Duplicate Contract Bridge. We do not always include the procedure regarding Alerts and/or Announcements, since these regulations are changed and revised during time by the governing body. It is our intention only to present the information as concisely and as accurately as possible