Structural Differences to ACOL


The key structural differences:

A) Abandonment of reversing values
B) Reduction of the frequency  of the weak 1NT and increased frequency of a 1C opening
C) Beta works with any strength of a 1NT with a 2 point range. Even variable with vulnerability if you choose. A 1NT opening will be at least 4-3 in the minors, Diamonds always 3 or 4 cards, Clubs 3 to 5 cards. Also: No singleton allowed.  However a 2245 distribution 4D's and 5C's may be held.
D) 1DHS openings are always 5+ cards and the longest suit and 10+ HCP. and usually maximum 8 LTC - ideally 7 1/2.. There is one exception: With  4-4 in the majors is opened 1H with an obligatory response of 1S with 4+ cards when without 4+ Hearts when a support sequence must be employed.
E) 1C! opening will be a forcing opening of at least 12+ HCP. Clubs can be with just 2 cards and therefore this opening must now be be always alerted. If using a 12-14 NT it will more often be 13+ HCP unless with 6+ card Club suit. Major transfers will be a cornerstone of the immediate response. A 1NT response is weak 0-8(9) HCP with no 4+ card major & 1S will also denyholding a 4+ card Major suit but promise (9)10+ HCP. See 1C opening for full details.
F) Betaacol's other structural MUSTS:  2D Multi forcing opening  and 2Ma non-forcing strongish, usually 15+ HCP but precisely a conservative 4-5 LTC being their 'gold' standard.
G) Betaacol's:  2C opening is either a 23+ Balanced hand or any distributional hand with maximum 3 1/2 LTC & usually 18+ HCP - but less is allowed with exceptional hands.
H) Beta promises the best balance between developing 4 & 5 card suits. While 1DHS are 5 cards. 1C opening caters for 4 /card suits. Also 1H opening caters for 4-4 in the majors. A rebid in any suit promises 6+ cards - opener or responder.

Beta ACOL has removed all adherence to the concept of REVERSE
The REVERSE is the structural  feature of ACOL that has limited its evolution for 75 years!
While we do admit the reverses 'ample' mathematical basis, we also realise:
Naturally we must admit that we sail closer to the edge! This will on some occasions lead to being 1 level too high in minor 2-3 level part scores. On the other hand our revised 1C opening allows a major fit to be established at the 1-level and played there!

In compensation of the no reverse policy we are structurally obliged to use strongish Majour 2's opening  Minimum distribution requirements are: either 54xx (preferably xx=31) or 6xxx where one x is 0 or 1 card. (excludes 6322 hands) The 2nd rebid is made in the portion (3 card suit). These bids limit the opening playing strength of 1HS distributional openings..
Further compensation is the use of short suit jump rebids available over 1DHS openings showing top-end 1 openings with a single suited hand with a strong 2-3 (5 HCP minimum) card short suit.

Positive benefits of Beta ACOL:

Increased transfer of information during bidding
Accurate description of hand patterns
No lesser information on High card strength
Other aspects of the system offer increased systemised location of Honours
Ability to more accurately find thin slams and avoid bad slams
Many sequences aimed at making the the appropriate hand the declarer.

Not all these benefits are accrued to dropping the reverse concept. The following structural additions have contributed (admittedly others could graft some of what follows onto their own ACOL system card)

Handling of 3-suited hands: 4441 & 4450 hands with both majors are opened 1H, otherwise opened 1C or 1D respectively. Beta's multi  1NT o'call can be used to show a quality 3-suited hand with shortage in the opener's suit..

3minor openings are used to show 2-suited hands 5+ - 5+ with 4-7 LTC: 3C both RED suits & 3D both Majors. While the '3rd leg' of the our 'Multi 2D' opening's 3 minor rebids: 3C showing C + H, while 3D shows D + S.
5+ - 5+  In S & C are opened 1S & Both minors by 1D.

A 1 Club opening has always a minimum of 2 cards and promises a good 12+ HCP and must always be alerted. If playing a 12-14 NT, a shapewise valid 1 NT opening is always to be preferred to a 1C with 3 cards in clubs in specifically a {42}43 distribution - however {43}42 must be opened by 1C. The latter is preferred as responder with a 5 card major can more easily determine a 5-3 fit more easily [1C-1DH-1N-2C(crowhurst) - 2HS.

First loss of 3-level pre-empts is not as diadvantgeous as it might at first appear. First of all these minor  pre-empts are not the most effective and good defence mechanisms help to negate them. Also for declarer after such pre-empts have been made, provide valuable information on distribution of the opponents hands.
Beta ACOL makes extensive use of showing TWO features with a single bid: Usually shown by bidding the lower of the two cyclically.

2-suited overcalls in defensive situations.

In protective position following a suit opening
In response to partner's T-O *
Following inverted minor to check for presence of guards for a 3N contract
Exploring help after a Major fit is established to determine a game or part-score contract.
In the defence of an opponents weak 1NT opening

There are many more features of note in Beta ACOL:
Beta ACOL is truly a system in its on right. Clearly owing to its ACOL heritage and also to 5 card major systems
A reader should take this into account when looking at this highly integated system and try to grasp the underlying pervading principles it is based upon.

Beta is a serious system with advantages over both ACOL,  5 card major and strong Club systems.