yfyh1297

Thank you for all responses. I saw it from a convention card from ecatsbridge，However，it do not include overcall. The link is as followed，http://info.ecatsbridge.com/Systems/2011WorldTeams-Netherlands/BermudaBowl/China/li-liu.pdf it emerges in page three ，the first page about supplymentary notes.

who can introduce this convention？