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This chart applies to:

1. All NABC+ events with no upper masterpoint restrictions played at an NABC.

2. All unrestricted Flight A regionally rated events at an NABC.

3. Any bracket of a bracketed KO at an NABC which contains no team with a bracket designator (average masterpoints of the entire team or top two players) of less than 1000 points.

This chart (or any part) may apply to any sectionally or regionally rated event or tournament at sponsor's option provided that this has been included in tournament advertising. (The requirement for advertising does not extend to use in Flt. A or high brackets of KOs.)

When using a method permitted by the Mid-Chart but not by the General Convention Chart, a pair is required to:

1. Pre-Alert the method(s)*

2. Have a written description of the method(s) available for the opponents.

3. Except for those methods authorized by sections bleow with an asterisk (numbers 2, 3, and 9 under ALLOWED), have a copy of the approved suggested defense available for opponents. Approved defenses are available in the ACBL defense database at

A defense to a method which requires the above pre-Alert may be referred to during the auction by both pairs.


To get a defense approved, a complete written explanaton of the method and a complete written defense must be submitted to ACBL in Memphis, attention Chief Tournament Director by regular or e-mail to

In addition, a method may be approved experimentally for Mid-Chart events. In order to have a method approved experimentally, a complete description with suggested defense must be submitted to ACBL, attention Chief Tournament Director, as above.



 ALLOWED ** Unless specifically allowed,
methods are disallowed **

1. All of the ACBL General Convention Chart.

2.* Relay (tell me more) systems that promise game-forcing values.

3.* All other constructive rebids and responses are permitted, except for:

a. relay systems that show less than game-forcing values,

b. conventional calls after natural notrump opening bids or overcalls with a lower limit of fewer than 10 HCP or with a range of greater than 5 HCP (see #9 under RESPONSES AND REBIDS and #7 under DISALLOWED on the General Convention Chart) - however, this prohibition does not extend to notrumps that have two non-consecutive ranges neither of which exceeds 3 HCP, and

c. conventional calls after a weak two-bid with an agreed range of more than 7 HCP or an agreement where the suit length may be four cards (see #6 under RESPONSES AND REBIDS and #7 under DISALLOWED on the General Convention Chart).


4. Any call that promises four or more cards in a known suit.

(See items #6 and #8 in DISALLOWED below.)

5. Opening 2D showing a weak two-bid in an unspecified major and may include additional strong (15+ HCP) meaning(s).

6. A 2S or 2NT opening bid showing an unspecified minor or both minors.

7. A transfer opening bid at the two-level or higher showing a weak bid in the suit being transferred to or a type or types of strong hand.

8. Any strong (15+ HCP) opening bid.

9. Notrump overcall as a two-suit takeout showing at least 5-4 distribution.

10. *Defenses to natural notrump opening bids and overcalls.

11. Any opening bid at the three level or higher showing an undisclosed solid suit.


1. Conventions and/or agreements whose primary purpose is to destroy the opponents' methods.

2. Psyching of artificial opening bids and/or conventional responses thereto.

3. Psychic controls. (Includes ANY partnership agreement which, if used in conjunction with a psychic call, makes allowance for that psych.)

4. Forcing pass systems.

5. Relay (tell me more) systems except those that are game-forcing.

6. Opening one-bids which by partnership agreement could show less than 8 HCP. (Not applicable to a psych.)

7. Psyching a conventional agreement which may show less than 10 HCP and which is not permitted by the General Convention Chart. This includes psyching responses to or rebids of these methods.

8. Any weak opening bid which promises an unknown suit may not include as the unknown suit the suit named (the suit opened).


Same as listed on the General Convention Chart.


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