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This is a system of responses to 1 of a suit openings which is used in the earliest natural Culbertson system. It has several disadvantages, particularly that invitational hands are very difficult to communicate, since 1/1 and 2/1 are the only allowed bids with between 11-12 points. This is solved by adding Limit raises and Inverted minor raises. Additionally, the strong jump shift with 17+ points (which means 30+ for the partnership -- how often does that happen?) has since been relegated to a weak bid. Artificial strong responses to a major suit have taken its place. What you see below is the original system, and is therefore out of date. See the system of SAYC or BWS for a more up-to-date treatment.

Summary Edit

Natural responses to 1 of a suit
6-10 11-12 13-15 16 17-18 19+
Long suit normal responses Jump shift
8-card fit single raise others jump raise
Balanced[1] 1NT 2NT 3NT
No Fit 2/1
1/1

Major suit openings Edit

With three-card support and the correct point range, raise the major suit.

  • With 6-10 points, bid two of the major.
  • With 11-12 points, bid a new four-card suit and show the fit later.
  • With 13-16 points, bid three of the major. This is game-forcing.
  • With 17+ points, jump shift. This is game-forcing.

Minor suit openings Edit

Raising a major suit requires four-card support and denies a four-card major. Prefer to show four card majors after a minor suit opening.

  • With 6-10 points, raise to two of the minor.
  • With 11-12 points, bid a new four-card suit and show the fit later.
  • With 13-16 points, bid three of the minor. This is strongly invitational to 3NT or a minor suit game.
  • With 17+ points, jump shift. This is game-forcing.

New Suit Responses Edit

Without a major suit fit, bid a new suit. New suits require four cards (note: some require 5 hearts for 1-2).

  • With 6 or more points, bid any new suit at the one-level. It is sometimes non-forcing.
  • With 11 or more points, bid a new suit at the two-level without jumping.
  • With 17 or more points and a either a long (6-card) suit, a good notrump hand, or a good fit, jump shift.

Notrump Responses Edit

Notrump denies a four-card major.

  • With 6-10 points, bid 1NT. This is often a fallback bid if the preferred suit is unavailable at the one level.
  • With 13-15 points and a balanced hand (including pertinent stoppers), bid 2NT. This is game-forcing.
  • With 16-18 points and a balanced hand (including pertinent stoppers), bid 3NT.

ReferencesEdit

  1. NT response denies biddable 4-card major.

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