gwnn, on 2016-May-31, 15:27, said:
That just sounds suicidal. 2C really? When you know opener has 17-19 balanced? The upside of 2C is when opps get into some kind of a mess sorting out various strains (imagine our LHO having diamonds strong, our p raising clubs and our RHO bidding 3C over 2D,opener being 55 in the majors but having to distinguish it from 7 spades or 54 or 64 in the minors). When our LHO knows more or less the exact handtype of his/her partner it will be much easier for them to find their right strain (it could be defense against clubs). 2C is NOT pre-balance.
Sorry, but how do you know opener has a balanced hand? If it's 17-19 balanced, then yes, I would pass, because opener's hand is well-defined, and 2C isn't going to get in their way much. But most big club systems use 1c for all 16-17+ hands. It works wonderfully -- so long as the opponents are nice enough never to open their mouths. Interference, however, poses big problems, because it takes a lot of the systemic tools away.
In terms of getting doubled for penalty, that's actually more likely to happen when opener (playing a big club system) opens 1 of a major. Now he's 11-15 with 5+ of the major, so that his hand is very well-defined and responder can pass for penalties when it's right. It's very difficult to make a 2-level penalty double after a 1C opener, because responder has no idea what opener has.
In addition, your C are good enough you won't get Xed very often, anyway. In most big club systems, X by responder here would be 5-8; there is no way opener is going to pass. So responder will only pass with 0-4 (is he really then going to be strong enough to pass a reopening double?) or 9+ with strength in clubs (Qxxxx and a couple of cards on the side isn't a good penalty pass).
Accordingly, it has to be right to interfere with some number of clubs. At this vulnerability, I would bid only 2C; maybe partner can raise to 3. If NV, I would try 3C.
Also, the most effective defense against a big club is probably CRASH. It's very important to be able to show all two-suiters right away, and giving up X, 1d, and 1NT isn't a big price (those bids are next-to-useless anyway).
Cheers,
Mike