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Natural 1

  • MIN (11–13): 4+, but 2+ by passed hand
  • MAX (13–15): unbalanced 4+
1-11–15, 4+
1F, 4+#
1NTNF, 8–10
2INV+, 4+
2!LIM+, 4+
2!CONST P/C, 4–5, 5=
2!INV, 5–6, 4=
2NTBAL INV, 11–12
3!CONST, 8–10, 5+
3!PRE, 0–7, 5+
3!SPL, 0–1#, 4+

By passed hand, 1 contains a weak notrump.

P-1-11–15, 2+
2!PRE, 6+. BAL INV.
2NT!PRE, 6+
3INV, 6+#