lycier, on 2015-April-17, 18:11, said:
1- after 1♠,south rebid :
1nt showing 18-19hcp.
2nt showing 20-21hcp
Here there is no problem.
I think 1nt should be 18-20 and 2nt kept as it was, 21-23. I don't know think that range needs to be so tight for 1nt, and you stay lower by bidding 1nt on 20 when advancer doesn't have much.
Quote
2- 4♠ is a overbid actually,3♠ should be a best spot.So here it is a problem on Gib CC - it can't be solved unless use modern 2/1 approach,Wolff signoff convention.
Its bidding sequences:
After 1♠,bidding 2nt,then 3♣ relay to 3♦,north bid 3♠ is signoff.
If you don't use it,no way to signoff at 3♠.
Wolff is an unnecessary complication on this auction. 3
♠ should be weak signoff. If advancer wants to check back for 3 cd spade support, he can simply cue bid 3
♦. If he has 6+ spades and wants to be in game, 4
♠ is fine. You don't need a forcing 3
♠ here with strong hands, because 1
♠ denied a strong hand from failure to jump or cue. This allows 3
♣ to be NF, which is consistent with my preference to bid 1
♠ on weak 4
♠-6
♣ hands.
This is quite different from a non-competitive sequence where Wolff traditionally applies. In that case the 1
♠ call is unlimited, so there is much greater need to allocate calls towards stronger hands, and more willingness to give up say a minor partial to cater to those.