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Forcing 1NT

Unpassed 1-1NT is forcing to accommodate strong invitations, especially 6+, which is one step away from 4.

1-1NT-Usually 7–11, 0–3
2NF, 4+ or BAL MIN
2NF, 4+
2NF, 4+
2MIN, 6+
2NTBAL MAX
3MAX, 5+#
3MAX, 6+