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One of the fundamental principles of the system is that which governs the raises. The system, in fact, uses, to investigate slam, a method that tends to verify, before anything else, the presence of 2 major honors in trumps. In this way one avoids beginning a cue-bidding sequence, that, often, determines the controls in all the suits, but that ends at the 5-level, or worse even slam, without adequate strength in trump.
Naturally not all sequences allow verification at a low of the strength of trumps, but in all GF situations below 3NT the following rules are used:
When the raise must be given above the level of 3NT another rule instead is used:
In the sequence 1 - 2; 2 the situation is GF (reverse after a positive). South raises to 3 with a major honor in spades, but bids 2NT (describing her distribution), 3 (followed by a raise) or raises to 4 with just small cards. The immediate 4, 4 or 4 (spade fit; with a diamond fit South first bids 3) guaranteeing instead 2 major trump honors and slam aspirations.
In the sequence 1 - 1SA; 2 (no 5-card suit except clubs)-2 (no 5-card major);3 (no 4-card major)-3(suit), an immediate 4 would show a diamond fit with no major honor, but 3 (cue-bid, as North already denied 4 spades) followed by 4 guarantees 3-card support to a major honor.
With 1 - 2; 2 (just 4 hearts)- 4(cue-bid) South guarantees at least a 4-card heart fit with at least 2 major honors. With a weaker fit South can bid 4 or can instead continue 2 in order to, after 2NT by opener, bid 3, which is forcing but with a maximum of one major heart honor.
Raises of 1M openings
After the openings of 1 and 1 use the following table of raises:
From the table comes the following guidelines:
Raises after opening 1
After opening 1
Ex. 1 - 1; 2 - 3 shows at least 3-cards to a major heart honor and a long side suit (weak). The opener can ask for this side suit with the relay 3.
The immediate raise by opener in responder's suit also shows a fit with a major honor.
Ex. 1 - 1; 2 - 2; 3 shows 5+ clubs and at least 3 hearts to a major honor.
With a fit, but not a major honor
When one wants to raise, but doesn't have the required trump honor, one can: