2♣ is 23+ HCP or 3 losers hand. Responder use Control-Showing Responses, where One „control” = one king. Two „controls” = one ace or two kings.
| Response | Meaning |
|---|---|
2 | 0 or 1 controls |
2 | 2 controls |
2 | 1 ace and 1 king (3 controls) |
| 2NT | 3 kings (3 controls) |
3 | 4 controls |