All overcalls after a strong (>=15) 1-level opening of 1NT and also after precision's 1§ opening are conventional.
The 2- and 3-level overcalls have the same meanings as the identically named opening calls in MAF. There is one exception which will be expounded in next paragraph. The agreement, just made, also counts for the 4th hand player's overcall, if his right hand opponent has responded.
It is very probable that the strong variants of these multi way overcalls will occur nearly never in the described situations.
Now there are no NBB or ACBL rules that force a 2§ multi-way overcall to have only one weak suit meaning. There are no limitations for overcalls. The complementarity between the 2-level minor suit overcalls may be restored, in order to include the clubs again. So 2§ points to a 6+card in one of the minor suits and a weak hand. In very few cases it might denote a strong hand in NT or one of the the majors
All the meanings of the other weak jump openings remain unchanged when they are used as overcall on strong hands.
A double of, an opening which shows a strong balanced hand, like acol's iNT, is real; it shows a balanced hand with >=15 hcp's. A weak (<6 hcp's) partner should call his longest suit, when stronger he should pass.
An overcall of a weak 1NT openening bid is not conventional. It has the same meaning as the overcall on an opening bid of one in a suit.
A double of a weak 1NT openening bid is conventional bubbledouble again.
If you want to see examples of bridgames in which the matter, treated above, is practiced you should click on examples and choose for the appropriate convention or for any other typical call.
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