Since the Multi-2♦ effectively free up the traditional Opening bids of 2♥, 2♠ and 2NT, these three bids can be used for other purposes, most commonly for weak 2-suiter hands.

RCO 2s are . . . . . . . . . Opening bids of . . . . . . HCPs and at least a . . . . . . . shape. Most of the high cards should be located in . . . . . . . . and the hand typically contains . . . . losers. Occasionally the hand may have only . . . . . losers, but never more than . . . . (and then only when not vulnerable).

With virtually only 2 long suits to consider the Responder must therefore especially look at his well placed . . . . . . . . . . , rather than his losers or HCPs, which determine the strength of his hand and are the key to a suitable response.

Here follow the descriptions of the three Openings and some typical example hands.

A. Weak responses (with 0-11 HCPs)
With a weak hand of up to about . . . . . . HCPs do the best you can. If you think you Opener's 2♥ bid refers to the two major suits you may even . . . . . . . . If you are not sure use your judgement or bid your . . . . . . . . . . . . .
Here are some typical examples :

A. Weak responses (with 0-11 HCPs)
With a weak hand of up to about 11 HCP do the best you can. If you think Partner's Opening bid refers to the two black suits you may even Pass. If you are not sure use your judgement or bid your cheapest 3-card suit.
Here are some examples :

A. Weak responses (with . . . . HCPs)
With a weak hand of up to about . . . . HCPs usually bid your . . . . . . . . or use your judgement.
But do not bid . . . . , for that is the . . . . . . for the . . . . . . . after 2NT.
Here are some examples :

After these weak 2-Opening bids, it is not unusual for the Opponents to interfere, especially when the Responder has a weak hand too.   To cope with these situation act along the following guidelines.

After a Double by the Opponent, Responder's bid of a new suit when weak ("Pass or Correct") or the Relay of 2NT or 3♣ when strong remain the same as normal. The "Pass" and "Redouble" have additional meanings.

After an Opponent makes an Overcall Responder may

1. . . . . . . with a very weak hand and/or strength in the Enemy suit.

2. bid a new suit when weak (0-11 HCPs) : a "Pass or Correct" bid,

3. or . . . . . . . , which replaces the . . . . . bid, showing . . . . . and an interest in . . . . . . .