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 |
As clubs are directly under diamonds, bidding after 1♦(2♣) is pretty natural.
| 1♦(2♣) | - |
|---|---|
| X! | T/O, INV+ |
| 2♦ | PRE, 4+♦ |
| 2M | NF, 5+# |
| 2NT | NAT INV |
| 3♣! | INV+, 4+♦ |
| 3♦ | CONST, 4+♦ |
| 3M | FG, usually 6+# |
BTU vs Unusual handles 1♦(2♦) well. The third cuebid 2NT shows tolerance in both minors.
| 1♦(2♦) | Both majors |
|---|---|
| X | PEN for either major |
| 2♥! | FG+, 5+♣ |
| 2♠! | INV+, 4+♦ |
| 2NT! | INV+, 3+♦, 4+♣ |
| 3♥♠! | Ask for stopper |
Rubinsohl follows 1♦(2M). The forcing raise 3♣ and the preemptive raise 3♦ weaponize the diamond fit. FunBridge also inspires the Strawberry adjunct of 3♥♠.
| 1♦(2M) | - |
|---|---|
| X! | OPT, INV+ |
| 2♠ | NF, 5+♠ |
| 2NT! | TRF, 5+♣ |
| 3♣! | INV+, 4+♦ |
| 3♦ | NF, 4+♦ |
| 3♥! | FG, 5=OM |
| 3♥-3♠! | Ask for stopper |
| 3♠! | FG, 6+OM |
