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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♠F, 4+♠
1NT11–16, 4–5♦
2♣14–17, 4+♣
2♦11–15, 6+♦
2♥11–14, 4+♥
2♠!ART REV, 17–20
2NT!INV, 15–17, 6+♦, 0–2♥
3♣PRE, 11–13, 5+♣, 5+♦
3♦!INV, 15–17, 6+♦, 3=♥
3♥INV, 15–17, 4+♥
3NTSOL 7+♦, partial stops in ♠ and ♣
3♠!, 4♣!SPL, 0–1#, 4+♥
4♦!FG, 6+♦, 4+♥
1♦-1♠-4+♠
1NT11–16, 4–5♦
2♣14–17, 4+♣
2♦11–15, 6+♦
2♥!ART REV, 17–20
2♠11–14, 4+♠
2NT!INV, 15–17, 6+♦, 0–2♠
3♣PRE, 11–13, 5+♣, 5+♦
3♦!INV, 15–17, 6+♦, 3=♠
3♠INV, 15–17, 4+♠
3NTSOL 7+♦, partial stops in ♥ and ♣
3♥!, 4♣!SPL, 0–1#, 4+♠
4♦!FG, 6+♦, 4+♠