This opening is announceable in ACBL regulations.[1]

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)

Responses Edit

The responses to 1NT openings are very rich with conventions, and the best set of conventions is not thoroughly agreed upon.

Natural responses Edit

  • 2NT is invitational, showing 8-9 (strong 1NT) / 11-12 (weak 1NT) points and a balanced hand.
  • 3NT is an obvious sign-off at game with 10+ (strong 1NT) / 13+ (weak 1NT) points and a balanced hand.
  • 3-level suit bids are sometimes played as natural.

Most common conventional responses Edit

Somewhat common conventional responses Edit

Nonstandard conventional responses Edit

When 1NT opening has been doubled Edit

  • System may be on or off;
  • Pass and redouble may be conventional.

External links Edit

Opening 1NT with a five-card major Edit

Arguments for always opening 1NT with a five-card major Edit

  • Rebids will be easier (read: possible without lying)
  • Game-strength hands can often recover the 5-3 fit

External links Edit

Arguments for never opening 1NT with a five-card major Edit

  • 5-3 fits will often go undiscovered

External links Edit

Arguments for sometimes opening 1NT with a five-card major Edit

  • Measure the value of the fit by the Law of Total Tricks (i.e. soft values in side tricks detract from total tricks, so open 1NT)

External links Edit


  1. [1] No Trump Openings : State the agreed range for all natural 1NT openings

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