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Natural 1♥

  • MIN (11–13): 4+♥ but not 4333
  • MAX (13–15): 5+♥ or unbalanced 4=♥ 5+♣
1♥-11–15, 4+♥
1♠F, 4+♠
1NTNF CONST–INV, 0–3♠, 0–3♥
2♣♦FG, 4+#. INV, 5+#, 3=♥ or 6+#.
2♥PRE, 4+♥. CONST, 3=♥.
2♠!PRE, 6+♠
2NT!INV+, 4+♥
3♣♦!SPL, INV or S/T, 0–1#, 4+♥
3♥!CONST, 4–5♥
3NT!Choice of games, 33(43)
3♠!, 4♣♦!S/T SPL, 0–1#, 4+♥
4♥♠S/O
4NT!RKCB 1430

By passed hand

Raises become more constructive because everyone had a chance to bid. Opener can pass invitations with a mimimum 7–8-card fit. The unlisted rebids below 3NT are natural game forces.

P-1♥-11–15, 4+♥
2♣♦INV, 5+#
2♥CONST, 3+♥
3♥INV, 4+♥