I am sorry to say that but Lauria's version does not include a weak 6M (2M rebid) or strong hand (17+) ... Lauria's version includes a natural 2♣ rebid or any hand 15+ without 5-5 or 6-4 type
You may refer to Bocchi's version that only after ...
I would double looks like we have to make the last guess on this board and looks like the contract is down two .. Do we take 500 instead of 650 .. So 3 imps gain? So im not gonna risk 5hearts dowm ome in imps at the possibility of A of ...
In general the idea is .... When lebenshol sequence applies in competitive bidding the responder at the double has to identify his hand...the italian style is reversed than the standart... NT bid (1 or 2) shows a good hamd about 8-11 points and immidiate bid shows 0-7
I have something else that you may like :)
3♣ = 5+-4+x slam try with another suit (3♦ = R, bids are the same with a slam try hand)
3♦ = one-suited
3♥ = 5+♥-4+♣, just GF
3♠ = 5+♥ - 4+♦, just GF
3nt = 5 ...