3 Part score: 19-24 points
13 Balanced hands (no void/singleton, <=1 doubleton):
15 15-17: 1 of a suit, rebid 1NT
16 18-19: 1 of a suit, rebit 2NT
18 23-24: 2Club, then rebit 2NT
21 6-9, 7-card suit, poor defensive values: pre-emptive 3 (8-card suit: 4)
22 12-19 1 of longest suit [rule of 20: open if hcps and length of 2 longest suits>=20]
23 16-22, 8 playing tricks, 6-card suit or at least 5-4 two-suiter: 2D,H,S,
24 23+ 2Club (forcing to game)