2© and2 opening bid, responses and rebids etc.

MAF uses a convention for the 2 and 2© openings which is well known. The names, by which the convention is known, are different: "Tartan", "Dutch Two", "Polish Two" and in the Netherlands "Muiderberg". If one of these names looks familiar to you, it it still possible that you have a different convention in mind, because sometimes completely different conventions live under the same name. We do not therefore consider it superfluous to explain the convention, for the two level opening of the major suits that is applied in MAF.
Moreover I have added a few maffe properties to the convention, you never have heard of before, like I also did with the multi-colored convention. Of course you should be informed about these extensions.

The convention I drive at, is meant for weak two suited hands. These hands must have a 5,4- distribution, of which the 5-suiter has to be a major suit. As addition to the well known convention ,not only one but, both 5,4 major suit have assimilated into the convention now.

Before proceeding I must tell you that the 2© and 2 openings are so very similar, even more similar then the 2 and the 2 openings are, that only one description will be given for both opening bids together. As a result of this, the texts under the pair of accompanying link-buttons are identical.

Before we start explaining the convention, something must be said about weak two suited openings in general.
In the meantime you must have become accustomed to my way of explaining, exploring and analyzing. So here is another table again:



 
  2©/  weak, not forcing *   pass weak, fit 2+card ©/  or: very weak: <=8 <12
  if forced: rebid is 3 in second suit 2 Sohl on 2© : no support, weak, non-forcing, 4-card ** 8-12
a: 5-card 4-card © 8-11    2NT FAKE-Sohl : strong, forcing 4-card or fit in © **  
b: 5-card 5-card / 8-11                p: fit: >=3-card ©/, ..... 3 or 4©/? >=12
c: 5-card 4-card / 8-11               q: no fit ©/, 4-card other major, .... 3NT or 3/4?? >=12
d: 5-card © 4-card 8-11               r: no support, any very strong 5-suiter  >=16
e: 5-card © 5-card / 8-11    3 no support, weak, non-forcing, 3+card >=8
f:  5-card © 4-card / 8-11   3 no support, and also no clubs, non-forcing, 4+card >=10
type frequency of 2 %
absolute relative
a: 0.601 28.64
b: 0.383 18.26
c: 1.113 53.10
total: 2.097 100.00
 
type frequency of 2© %
absolute relative
d: 0.601 28.64
e: 0.383 18.26
f: 1.113 53.10
total: 2.097 100.00
  3©/ fit, 3+card, after 2©/   14-15   
  3/© 6+card, no fit in ©/, ..... pass, 4/© or 3NT ? 12-15
  4©/ 3+card ©/, to play >=16
 
 
 
 
* If there is no fit in opening suit, the opener's rebid generally is his second suit.
He has to pass to a 2 response always, if he holds 4 spades.
** With weak hands, holding a 4-card spades, 2 is the compelled response to
a 2© opening bid if there is no fit in hearts. With strong hands, 2NT may only
be responded if the hand allows for a 3 or 4©/ contract through the opener's
rebid. The latter is not required if a 4© contract is easily achievable.
 

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If you arrived here because you wanted to read about the "sohl principle" then we give you the opportunity to link to various other paragraphs where remarks are made about "sohl":

1-Sohl 1-Sohl 1©-Sohl 1-Sohl 1NT-Sohl 2NT-Sohl 3NT-Sohl
the SOHL overview
This looks very simple, compared to the 2/ diagrams. However don't mistake yourself. Under certain conditions it can get rather complicated.
The answers can be arranged in various groups. This looks very simple compared to the 2/ diagrams, but we will see that after all it may get rather complicated under certain circumstances.
The responses can be arranged in groups of different types: