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Natural 1♦

This opening shows 5+♦ or unbalanced 4=♦ 1–5♣. Unlike Polish Club 2020, I use standard (i.e. non-inverted) minor raises along with mixed raises to maximize preemption. This method utilizes 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♦-11–20, 4+♦
1♥F, 4+♥, usually 6+
1♠F, 4+♠, usually 6+
1NTNF, 6–10, 4+♣
2♣FG, 4+♣ or 4+♦
2♦CONST, 6–9, 4+♦
2♥!P/C, 6–8, 4–5♥, 5=♠
2♠!INV, 9–11, 5–6♠, 4=♥
2NTBAL INV, 10–11
3♣INV, 9–11, 6+♣
3♦INV, 9–11, 4+♦
3♥!FG SPL, 0–1♥, 0–3♠, 4+♦
3♠!FG SPL, 0–1♠, 0–3♥, 4+♦
3NT11–15, 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♦-11–20, 4+♦
2♣INV, 5+♣, 0–3♠, 0–3♥
2♠!LIM, 3+♦