Before the age of Internet bridge,as a non-professional player,I had not enough informations about new/fresh conventions and systems. Thanks for USA's computer technology,I can take part in these forums and other online bridge activities. After read lots of bidding files,there is a problem up to me,which is that whats the principle of bridge bidding? You know,in the bridge match,there are lots of different systems playing a same set of cards,most of them can arrive same contracts,that's to see,there are a principle of bidding. So,trying to find the principles,I decide to reaearch on bidding,conventions and systems,and now I think I might get some of them. That's the reason why I have a special interest on system changes. Thank you for accessing my blog and giving some opinions on systems or conventions.