A 1NT opening is a very specific bid. All natural 1NT openings specify a balanced hand (generally, no voids, no singletons and at most one doubleton) within a narrow range of strength (generally a range of 3 HCPs). Whether a 1NT opening contains a 5-card major is a matter of preference. * Mini notrump: 10-12 HCPs * Weak notrump: 12-14 HCPs * Strong notrump: 15-17 HCPs (or 16-18 HCPs)