2 opening bid, responses and rebids etc.           
The 2 opening is a kind of mirror image of the well known 2 opening (the multi-colored). If you know the last one, it not difficult to memorize the 2 opening. So the 2 opening is multi colored too. The principal differences between the two were necessarily caused by the league's legal regulations. The rules stipulate that regular openings on 2-level and 3-level, can only have weak meanings if, for any weak variant, at least one of the weak suits is revealed (an exception is made for the 2 opening).   So all weak meanings of a multi opened hand must contain at least one common suit. An exception is made for the 2 multi-colored, but not for the less known 2 multi-colored opening. Still there are a lot of similarities.


 
  2    multi colored 2 convention   2 weak   <=11  
  always forcing 2NT    strong                         >=12   
 
type frequency %
absolute relative
a: 2.073 57.91
b1: 0.398 11.13
b2: 0.266 6.31
c: 0.617 17.24
d: 0.006 0.16
e: 0.068 1.91
f: 0.191 5.35
total: 3.580 100.00
a: 6-card , weak **** *** 6-11  
b2: 5-card ©/, strong
b2: at least 8 sure tricks
*** >=20*
c: balanced hand rebid: 2/3NT 20-22
d: balanced, major suit oriented     rebid: 3/4NT     >=26
e: 5/4,4,4,0/1 distribution *** >=15
   short in , ©  
f: 5,5 in and , weak**** *** 10-14
 
  * or 8 straight tricks
  ** based on weak responses, otherwise one level up: 3/4NT
  *** for the bid sequences of these opening variants please have a look in the table which comes next
 **** unfortunately, due league regulations, complete similarity with 2 is impossible
 

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There are six different types of hands that may be opened by 2 and five different types of hands that may be opened by 2. All these different hands are related to each other. The large number of variants was enabled by the integration of the two 2-level minor suit openingbids, which of course would not have possible without the design of this 2 opening. Therefore it is not wise to apply one of these conventions and leave the other one alone. You must apply both (if you want: in a shortened version).

The response to 2 is nearly a relay. There are only two possibilities: Either you have opening-strength or you have not. Hence the number of possible rebids is very limited. This is shown clearly in the next table.
As you see the rebids are all very natural.

It is necessary to make a few supplemental remarks here.

a: en f:
After weak rebids there is no follow up bidding any more. Only in case f: the opener may show he prefers diamonds to clubs by rebidding 3 as a final bid.

c: en d:
After a 2NT rebid the follow up bidding is old fashioned:
either:   the well known Stayman- Jacoby(transfers for 4 suits)-conventions.
or: the Niemijer convention. (widely applied in the Netherlands)
The follow up after a 3/4NT rebid will mostly end up into a NT-contract; the suits called are real 5+cards. The first call in a new suit is always forcing.
The responder has all the data available to calculate the total number of hcp's. He is best equipped to determine the level, and kind also, of the final contract. In the very rare case that an opener has far more (30-37) then 26 hcp's he should dream up something nice himself; MAF does take such hands into account.
A rebid of 4NT should be considered as Blackwood. Now the opener has to decide about the final contract.

b:
If the responder has bad support (<=2 cards) in the opener's suit, the 2nd response should be 2NT.
By responding [2][3]/©/ or 4(jump) the responder tells the opener that he only has a doubleton in the planned trump suit but a 5+card in the suit called and sufficient hcp's for a game contract. The opener may rebid his own suit, showing a 6-card.
With support in his partner's suit and some strength, the responder will call 3/4(no jump) establishing the his partner's rebid-suit as trump suit and starting the exchanging of controls at least until the game is reached.
Here also the responder is in the best position to evaluate both hands in order to establish the final contract. He is most likely to possess hidden (for his partner) values.
A response of 3NT is "to play" without support in the suit the opener has in mind.

e:
The "free" rebid of 3 is not used, in order to avoid misunderstandings about "case f: hands". It is a pity the response is beyond the 3NT game but, the more probable major suit game bids are still within reach.
After the rebid of 4/, the responder must establish the trump suit. Again he knows nearly exactly what kind of a hand the opener has. So he is the proper player to determine which suit is going to be the trump suit.
The room for exchanging controls has inevitably been swallowed by the rebid. With jointly, at least, 32 hcp's and a sure singleton, which after all may appear to be a void too, the responder can safely proceed with Blackwood in case he is strong.
The responder is not compelled to inform his partner, about which suit is going to be the trump suit. As a matter of fact he only can do so by bidding a game, or after Blackwood has been started (by him!!), by bidding another suit then the cheapest one on 4/5-level, or by bidding a suit on 6/7-level.


 


 
  rebids after an opening: 2:   response:
 
  2   2NT
    weak hand strong >=12
       
a: 6+card , weak 6-11 pass 3
b: 5+card ©/, strong >=20 * 2©/ 3©/
c: balanced 20-22 2NT 3NT
d: balanced >=26 3NT 4NT
e: 5/4,4,4,0/1 distribution, short in /, game forcing >=20 4/ * 4/ *
f: 5,5 distribution in / 8-11 3 3
 
* the cheapest bid showing the void/singleton suit (weevandedree) (avoid errors: 3 and 3 have a fully different meanings!)
 



REMARK:

We have seen that the response of 2NT to both 2-level minor suit openings is always forcing. This looks very much like a sohl response. It is not a real Sohl, because the bid only has one meaning and moreover it is not the cheapest possible bid too. In both cases 2NT means: "the responder holds a hand with >=12 hcp's".
It would have been easy to attach several different meanings to the 2NT-responding hand. However I did not do so, because I did not consider it useful. Why should the opener be informed about the responders hand? As soon as the responder knows the opener's type of hand, he will probably always be the one who can evaluate the situation better than his partner.
Moreover, if his partner is weak, what 2 MiS openers mostly are, there is not much bidding room left for information exchange.

On the other hand, elsewhere I yet choose for using sohl responses in MAF at an even higher opening level. After both major suit openings at 2-level, a 2NT response is a strong (!!) sohl-response: forcing, as well as multi way. There it turned out to be useful, and was probably facilitated by the fact that 2-level MaS openings are not multi-way (at least not annoyingly).


If you want to see examples of bridgames in which the matter, treated in this section, is practiced you should click on examples and choose for the appropriate convention or for any typical opening bid.