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Natural 1♦ - 1M

The responses 1♦ - 1♥♠ show 4+ cards just like any 5-card major system. Responder has 6+ points most of the time, but sometimes responder bids with a freaky hand, especially with a long major suit and short diamonds.

1♦ - 1♥ -
1♠11–17, 4+♠
1NT11–15, 4–5♦
2♣11–17, 4+♣
2♦11–15, 6+♦
2♥11–14, 4+♥
2♠18–20, 4+♠
2NT18–20, 0–2♥
3♣!15–20, 3+♥
3♦16–17, 6+♦, 0–2♥
3♥15–17, 4+♥
3NTSOL 7+♦, partial stops in ♠ and ♣
3♠!, 4♣!SPL, 0–1#, 4+♥
4♦!FG, 6+♦, 4+♥
1♦ - 1♠ -
1NT11–15, 4–5♦
2♣11–17, 4+♣
2♦11–15, 6+♦
2♥15–17, 4+♥
2♠11–14, 4+♠
2NT18–20, 0–2♠
3♣!15–20, 3+♠
3♦16–17, 6+♦, 0–2♠
3♥18–20, 4+♥, 0–2♠
3♠15–17, 4+♠
3NTSOL 7+♦, partial stops in ♥ and ♣
3♥!, 4♣!SPL, 0–1#, 4+♠
4♦!FG, 6+♦, 4+♠

Artificial reverse 3♣

It has always been a headache for a minor suit opener to show invitational+ 3-card support in 5-card major bidding systems. This 3♣ convention solves that problem by replacing the strong jump shift. This reverse shares spirit with Odwrotka despite not in standard Polish Club.

This convention is as safe as 3♦. Opener has 6+♦ and denies all side suits when merely invitational.

1♦ - 1M -
3♣ -
3♦MIN, 4=M
3MMIN, 5+M
3NTS/O, 4=M
4♣!S/T in M, CTRL
4♦S/T in ♦
4MS/O, 5+M
1♦ - 1♥ -
3♣ -
3♠!S/T in ♥, CTRL

Conventional 1♦ - 2♥♠ already handle non-forcing (4+♥, 5+♠) hands. Thus, 1♦ - 1♠ - 3♣ - 3♥ must bundle enough values for slam exploration.

1♦ - 1♠ -
3♣ -
3♥S/T, 4+♥, 5+♠
4♥!S/T in ♠, CTRL