Natural 1♦
This opening shows 4+♦ and usually 5+♦. It gets more unbalanced as the strength increases.
| Strength | Distribution |
|---|---|
| 12–14 | 5+♦ or 4♦(441) |
| 15–17 | UNBAL, 5+♦ or 4♦(441) |
| 18–20 | UNBAL, 5+♦, 0–3♠, 0–3♥ |
Unlike Polish Club 2020, I use standard (i.e. non-inverted) minor raises along with mixed raises to maximize preemption. This method utilized the frequent 5th diamond in the 1♦ opening.
Note that 1♦-2♣ is sometimes a phony suit. It is the only way to bid a game-forcing hand with long diamonds and no side major suit.
| 1♦- | 12–20, 5+♦ or 4♦(441) |
|---|---|
| 1♥ | F, 4+♥, usually 6+ |
| 1♠ | F, 4+♠, usually 6+ |
| 1NT | NF, 6–10, 4+♣ |
| 2♣ | FG, 4+♣ or 4+♦ |
| 2♦ | NF, 6–10, 3+♦ |
| 2♥! | P/C, 7–9, 4+♥, 5+♠ |
| 2♠! | UNBAL INV, 4+♦ or 6+♣ |
| 2NT | BAL INV, 10–11 |
| 3♣! | CONST, 7–9, 4+♦ |
| 3♦! | PRE, 4–6, 4+♦ |
| 3♥! | FG SPL, 0–1♥, 0–3♠, 4+♦ |
| 3♠! | FG SPL, 0–1♠, 0–3♥, 4+♦ |
| 3NT | 12–15, 1–3♠, 1–3♥ |
P-1♦
Game forcing 2♣ becomes a natural invitation. Consequently, 2♠ is a limit raise because it no longer takes care of clubs.
| P-1♦- | 12–20, 5+♦ or 4♦(441) |
|---|---|
| 2♣ | INV, 5+♣, 0–3♠, 0–3♥ |
| 2♠! | LIM, 3+♦ |