I got this treatment from Chris Ryall's webpage, and it is part of a co-ordinated system. The bid balanced hands start with 2D or 2NT, so a 2C bid doesn't include those (unless a monster so you can afford jump to 3NT). This frees up a 2NT rebid by opener to show the three suiter. 3♣ by responder now ask for short suit and number of losers, and when opener show it, responder can then use short suit/NT relays to ask about number of losers and exact shape (4441 or 4450), number of controls, then lowerst suit without a queen.
I have found this to be a most excellent weapon. Imagine this pair of hands Misho and I played recently...
S-AJx
H-Ax
D-xxxxx
C-JT9
S-KTxx
H-x
D-AQJT
C-AQxx
South's hand just qualifies as a "strong" three suiter (minimum controls is 5, minimum hcp is 16, max number of losers is 5). Bidding was....
RHO South LHO Misho
Pass 2C Pass 2D
2H 2NT Pass 3C (2NT = three suiter)
Pass 3D Pass 3H (3C=ask, 3D=short H, 4-5 loser)
Pass 3S Pass 5D (3H ask, 3S=4144, 5losers)
Pass Pass Pass
As you can see, if the diamond hook is off, 3NT is in a world of hurt, but 5D is virtually iron clad, and 6D will make anytime 3NT is making, then 6D also makes (5D, 1H, 1Hruff, 2S, and 3C). Misho could have bid 3NT to ask for controls, my bid would have been 4C to show 5, then if he wanted, he could bid 4H to ask for lowest suit without QUEEN, I would have bid 4S. Here he knows all. I have either Kxxx x AQJx AQxx or possibly xxxx x AQJx AKQx or xxxx x AKQJ AQxx) actually with such a weak spade suit, I would not open the last two with 2Cs, since to get to my 16 hcp and 5 loser hand. So he would know that slam is 50% (find diamond king) on the first two hands, and 50% on the third (find the club king).
To read more about this nice treatment, see Chris Ryall's page at... (but remember, you need to be able to describe balanced 22-24 point hands some other way than 2C-2D-2NT, to play this)
http://www.chrisryal.../clubs-4441.htm
There was a nice challenge the champ hand in Bridge World circa 1981 that Woosely and Mansfield were bidding. The hand pair was perfect for this method. The hands were something like....
Quote
AQxx KJTxx
ATxx xxx
x Axx
Where 7H is the top spot (getting more than 10) and 6H was an average. The bidding with the three suit thing makes this a piece of cake.
2C-2D-2NT(3suit)-3C(which?)-3NT(shortC, 4-5L), 4C(dist?)-4D(4441, 5L)-4NT(controls)-5D(6controls)-5N(queens?)-6D(no diamond QUEEN)-7H....
Why 7H, WEST would not show C-K as control, so has three aces, with no diamond Q (or king). His 5 losers must be, 1C, 2D, and 1 each in the majors. So EAST can "see" west as having AQxx AQxx Axxx x.... and can count 13 tricks, 4S, 5H, 1D, 1C, and 2 club ruffs. This was the first hand my partner and I put to the three suit test (he found it and emailed me the responder's hand), and we have never looked back since then.
Ben