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
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 email@example.com.
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.
Unless specifically allowed,
methods are disallowed **
1. All of the ACBL General Convention
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
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).
THIS APPLIES TO BOTH PAIRS.
4. Any call that promises four or more
cards in a known suit.
(See items #6 and #8 in DISALLOWED
5. Opening 2D
showing a weak two-bid in an unspecified major and may include
additional strong (15+ HCP) meaning(s).
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
Same as listed on the