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Semi-forcing 1NT

1♠ - 1NT -
2♣11–16, 2+♣
2♦11–16, 4+♦
2♥11–16, 4+♥
2♠11–14, 6+♠
2NT!15–16, 6=♠, ≤ ♠AJ9
3♣♦♥15–16, 5+#
3♠15–16, ((6+♠, AJT+) or 7+♠)
3NT!Gambling, 7+♠ AKQ, no outside A/K

The threshold of suit quality is based on Binky Points:

Holding     NT   Suit
 KQJxxx   0.20   0.14
 AT9xxx   0.13   0.14
 KQJ9xx   0.21   0.19
 AJxxxx   0.32   0.23
 KQJTxx   0.29   0.26
 KQJT9x   0.29   0.29
 AJ9xxx   0.44   0.29
 AJTxxx   0.57   0.40
 AJT9xx   0.63   0.45
 AQxxxx   0.76   0.52
 AQ9xxx   0.86   0.57
 AQTxxx   0.99   0.65

—holdings.new.txt, Binky Points computed by Thomas Andrews in 2008

Precision 2NT

The invitational 2NT from Precision shows 6 cards in the major. Opener is a narrow maximum, so responder places the contract. The only artificial bid is 3♣, asking whether opener holds three hearts so that a 5–3 heart game can replace 4♠ or 3NT. Everything else is natural — a weak club one-suiter has to pass.

1♠ - 1NT -
2NT -
3♣!Ask for 3+♥
3♦S/O, 6+♦
3♥S/O, 6+♥
3♠S/O, 3=♠
3NTS/O
4♠S/O, 3=♠
1♠ - 1NT -
2NT - 3♣ -
3♦!0–2♥
3♥3+♥