Bergen (modified)

After 1M opening bid (on all seats), the 3♣ bid shows 4+ card support and:

7-9 HC

or

singleton and 7-9 HC

or

10-12 HC no singleton

or

10-12 HC and 5 card side suit with 2TH3

1M - 3♣ -

3♦    =    14+ HC, relay    ➲

3M   =    TP, 13- HC