Competing at the 1-level
This part shares similarities with the 1♣ opening. There are also differences since 1♦ shows a long suit that allows further preempts.
- Notrump transfers to clubs as its natural meaning is not very useful.
- Unlike 1♣(X), there is no space for Transfer Walsh here.
- Reuse 1♦(X)2♣ for Flannery because the rebidding problem persists.
| 1♦(X) | - |
|---|---|
| XX | NF BAL G/T, 10+ |
| 1M | F, 7+, 4+# |
| 1NT! | TRF, 7+, 5+♣ |
| 2♣! | ART, 5–11, 5+♠, 4+♥ |
| 2♦ | PRE, 0–7, 4+♦ |
| 2M | PRE, 0–7, 6+# |
| 2NT! | TRF, PRE 7+♣ or FG 6+♣ |
| 3♣! | INV+ TRF, 4+♦ |
| 3♦ | CONST, 8–10, 4+♦ |
| 3M | PRE, 7+# |
Spades below 3NT are transfer cuebids.
| 1♦(1M) | - |
|---|---|
| 1NT | NAT, 8–10 |
| 2♣ | NF, 8–11, 5+♣ |
| 2♦ | PRE, 0–7, 4+♦ |
| 2♠! | INV+ T/O, no other suitable call |
| 2NT | NAT INV, 10–11 |
| 3♣! | INV+ TRF, 4+♦ |
| 3♦ | CONST, 8–10, 4+♦ |
| 4OM | To play |
| 4M! | S/T, ask for CTRL |
Transfer Walsh only applies to 1♦(1♥), the only 1-level red suit.
| 1♦(1♥) | - |
|---|---|
| X! | TRF, 7+, 4+♠ |
| 1♠! | TRF to 1NT, 8+ |
| 2♥! | TRF, 6+♠ |
| 3♥! | INV+ TRF, 6+♠ |
| 3♠! | FG, 6+♣ |
The whole bidding structure leans toward hearts over (1♠). A well-known example is the negative double.
| 1♦(1♠) | - |
|---|---|
| X! | TRF, 7+, 4+♥ |
| 2♥ | NF, 5+♥, 7–11 or 6+♥ |
| 3♥ | INV, 6+♥ |
| 3♠! | FG, 6+♥ |