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Natural 1♠

  • MIN (11–13): 4+♠ but not 4333 or 44(xx)
  • MAX (13–15): 5+♠ or unbalanced 4=♠ 5+♣

Inspired by Twisted 2/1, the suits for 2♣♥ are swapped.

1♠-11–15, 4+♠
1NTNF CONST–INV, 0–3♠
2♣!FG, 4+♥. CONST, 5=♥. Any 6+♥.
2♦!FG, 4+♦ but not 4=♥. INV, 5+♦, 3=♠ or 6+♦.
2♥!FG, 4+♣ but not 4=♥. INV, 5+♣, 3=♠ or 6+♣.
2♠PRE, 4+♠. CONST, 3=♠.
2NT!INV+, 4+♠
3♣♦!SPL, INV or S/T, 0–1#, 4+♠
3♥!INV, 6+♥, 3=♠
3♠!CONST, 4–5♠
3NT!Choice of games, 3(433)
4X!S/T SPL, 0–1#, 4+♠
4♠S/O
4NT!RKCB 1430

By passed hand

New suits by passed hand are completely natural. It limits the benefit of the 2♣ transfer to hearts that responder fails to preempt. The natural 2♣ also proposes a reasonable contract. 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+♠
2XINV, 5+#
2♠CONST, 3+♠
3♠INV, 4+♠
P-1♠-2♣INV, 5+♣
2♦!MIN, 5=♠
2♥MIN, 4+♥, 5+♠
2♠MIN, 6+♠
3♣MIN, 3+♣, 4=♠
P-1♠-2♦INV, 5+♦
2♥!MIN, 5=♠
2♠MIN, 6+♠
3♦MIN, 3+♦, 4=♠
P-1♠-2♥INV, 5+♥
2♠MIN, 6+♠
2NTMIN, 5=♠
3♥MIN, 3+♥