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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♥-4+♥
1♠11–17, 4+♠, 5+♦
1NT12–14, BAL 5=♦
2♣11–17, 4+♣, 5+♦
2♦11–14, 6+♦
2♥11–14, 4+♥
2♠!ART REV, 15–20, 3=♥, 6+♦ if 15–17
2NTFG, 18–20, 0–2♥
3♣15–17, 5+♣
3♦15–17, 6+♦, 0–2♥
3♥INV, 15–17, 4+♥
3NTSOL 7+♦, partial stops in ♠ and ♣

There is no luxury for an artificial reverse of 3=♠ to 1♦-1♠. I suggest overloading 1NT since 1NT encourages bidding a 5-card major.

1♦-1♠-4+♠
1NT12–14, BAL 5=♦; 15–17, 3=♠, 6+♦
2♣11–17, 4+♣
2♦11–14, 6+♦
2♥15–17, 4+♥
2♠11–14, 4+♠
2NTFG, 18–20, 0–2♠
3♣15–17, 5+♣
3♦15–17, 6+♦, 0–2♠
3♥!FG, 18–20, 3=♠
3♠INV, 15–17, 4+♠
3NTSOL 7+♦, partial stops in ♥ and ♣

Reverses and Lebensohl

For precise game try, we reuse 1♦-1♥-2♠-2NT as Lebensohl to park minimum hands.

1♦-1♥-2♠-INV+, 3=♥
2NT!LEB, MIN
3♣!“4SFG”, ask for 3=♠ or stopper
3♦FG, 2+♦
3♥FG, 6+♥
3♠FG, 6+♠
1♦-1♠-2♥-INV, 4+♥
2♠NF, usually 6+♠
2NT!LEB, MIN
3♣!4SFG
3♦FG, 3+♦
3♥FG, 4+♥
3♠FG, 6+♠