[vitorlopes]

Playing normal Precision, with the following Match-Point bidding:

Opener Hand: 5=3=1=4
Responder Hand: 1=3=6=3

1♣-(P)-1♦-(P)
1♠-(P)-2♦-(P)

Assume that 1♠ is limited to a bad 21 HCP (yes, they do exist!) and 2♦ shows 6-7 HCP.

1. Should Opener rebid 3♣ with 16-18 HCP?
2. Should Opener rebid 4♣ with 19-21 HCP?

[helene_t]

somewhat depending on honour location but most likely opener should pass with 16-17, bid 2NT with 18-19 and 3NT with 20-22. Or something like that.

[rhm]

vitorlopes, on 2013-April-09, 02:20, said:

Playing normal Precision, with the following Match-Point bidding:

Opener Hand: 5=3=1=4
Responder Hand: 1=3=6=3

1♣-(P)-1♦-(P)
1♠-(P)-2♦-(P)

Assume that 1♠ is limited to a bad 21 HCP (yes, they do exist!) and 2♦ shows 6-7 HCP.

2. Should Opener rebid 4♣ with 19-21 HCP?

This depends on agreements
But agreements, which suggest to bypass 3NT, when there is a suggestion of a misfit already and 3NT is your most likely game contract, are simply a big error in Bridge judgment.
Agreements must first cater for the most likely successful contracts not the least ones.

Rainer Herrmann

[WellSpyder]

vitorlopes, on 2013-April-09, 02:20, said:

1. Should Opener rebid 3♣ with 16-18 HCP?
2. Should Opener rebid 4♣ with 19-21 HCP?

I would expect 3♣ to be forcing, on normal approach forcing principles, so there is no need to jump to 4♣ without significantly more shape than 5-4. If you don't want to bid 2N/3N, then 3♣ sounds OK to me.