Type of bid

North

East

South

West

Points

Type of hand balanced? stopper?

Opening

1NT

12-14

Balanced, 3 winning tricks

Responding

1NT

Pass

2NT

12

Typically, no 4+ card major (use stayman if a 4 card major, trf if 5+)

Responding

1NT

Pass

3NT

13-18

12 + 13 is 25 (min), 19+ go via stayman or quantitative 4NT

Responding

1H

Pass

1NT

6-9

Limit bid, 3 or less Hs

Overcall

1H

1NT

15-18

2 Stops in Hs

Responding after Overcall

1H

1S

1NT

6-9

Occasionally a little stronger, 1 S stopper

Responding to an Overcall

1H

1S

Pass

1NT

8-11

2 or less S and 1.5 H stopper

Responding to an Overcall

1H

1S

Pass

2NT

12-15

Assuming 10+ for overcall, invite to 3NT if 13+, shows 1.5 H stopper

Responding to an Overcall

1H

1S

Pass

3NT

15-19

Shows 25+ combined points with 1.5 H stopper

Rebid by Opener

1H

1NT

Pass

1S

Pass

15-16

Balanced, likely 4H (occasionally 5)

Rebid by Opener

1H

2NT

Pass

1S

Pass

17-18

Balanced, likely 4H (occasionally 5)

Rebid by Opener

1H

3NT

Pass

1S

Pass

19

Any shape, exactly 19 (as 20 would open strong)

Rebid by Opener

1H

2NT

Pass

2C

Pass

15-16

As 1NT re-bid (some play this 15-18)

Responding to a double

1H

double

pass

1NT

6-9

No H support but points to reply to Opener, not 4S also

Responding to a double

1H

double

pass

2NT

10-12

No H support but points to reply to Opener, not 4S also

Responding to a double

1H

double

pass

3NT

13-19

No H support, unlikely 4S, points for game

Opening

2NT

20-22

Balanced

Responding

2NT

pass

3NT

5-10

Any shape but normally less than 4 in each major

Rebid by opener

2C

2NT

pass

2H

23-24

Balanced

Responding

2H

pass

2NT

>7 if Strong 2H

15+ if weak 2H

Negative reply, any shape if Strong 2H

Strength enquiry, any shape if Weak 2H

Responding

2D

pass

2NT

>7 if Strong 2D

>7 if 2D is 23+

Negative reply, any shape if Strong 2D

Balanced positive, any shape if 23+ 2D