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Non-forcing 1NT

Opener is free to pass 1♥-1NT with a balanced minimum. The best major fit at 1♥-1NT-P is balanced 5-3. Opener can judge when to pass quite safely.

The 2♣ rebid promises 3+♣ like Wbridge5 to ensure a safe courtesy raise.

1♥-1NTUsually 7–11, 0–3♠, 0–3♥
2♣3+♣
2♦4+♦
2♥11–14, 6+♥
2♠15–17, 4+♠
2NT15–16, 5=♥, 2–3♠, 2–4♦, 2–4♣
3♣♦15–16, 5+#
3♥15–17, 6+♥
3♠15–16, 4+♠, 6+♥

Impossible spades

As 1NT denies 4+♠, the 2♠ rebid must be artificial. The impossible 2♠ is a forcing raise that is stronger than a courtesy raise.

1♥-1NT 2♣-NF, 3+♣
2♦NF, 5+♦
2♥NF, usually 2–3♥
2♠!STR INV, 4+♣
2NTBAL INV
3♣Mild INV, usually 5+♣
3♦INV, 6+♦
3♥INV, 3=♥
1♥-1NT 2♦-NF, 4+♦
2♥NF, usually 2–3♥
2♠!STR INV, 4+♦
2NTBAL INV
3♣INV, 6+♣
3♦Mild INV, 4+♦
3♥INV, 3=♥