Competing at the 2-level
Bidding against 1♣(1NT) is analogous to a weak notrump. The agreement to borrow Landy 2♣ here is also called Landik.
| 1♣(1NT) | - |
|---|---|
| X | PEN, INV+ |
| 2♣! | UNBAL, 4+♠, 4+♥ |
| 2NT! | UNBAL FG |
Otherwise, treat 1♣(2*) like 1NT(2*). Opener has shown no suit but strength.