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Contract Bridge

Weak jump shift

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Weak jump shifts developed out of recognizing that the strong jump shift was both rare and redundant, since the same contracts could typically be reached by other means. It is a form of preemptive bids.

Treatment Edit

In response to a one-level suit opening, a jump shift shows 2-4 high card points (typically KJ or less, not enough for 1NT response), and

  • at the 2-level, a ~6 card suit
  • at the 3-level, a ~7 card suit

With longer suits, a 1/1 or 1NT response is to be preferred. As set out here, weak jump shifts somewhat resemble weak two bids, albeit with a slight shift in the points.

Double jump shift responses Edit

In natural bidding, double (or higher) jump shifts are weak as well, showing a 7+ card suit and about 4 playing tricks short of the bid.

This treatment is off is any of the conventional higher jump shift responses are used, including splinter raises and exclusion Blackwood. Note that some of these conventions apply only to major suit openings, so that weak double jump shifts may still apply after minor suit openings.

Opener's rebids Edit

  • Typical response is to pass.
  • 2NT is the only forcing response and is a game try, suggesting at least 2-card support.
    • Rebid suit at the 3-level with minimum, any other bid with a maximum.
  • Raise to three of responser's suit is a further preempt and not invitational.
  • Raise to four of responder's minor suit is invitational only in the absence of competition.
  • Any other suit is natural and not forcing, suggesting no support for opener's suit and a distributional hand.
  • Any other jump bid is natural and invitational.
  • Game bid is a natural sign off.

In competition Edit

Weak jump shifts are on after any overcall or double. Note that after an overcall, the level of bid might be higher to jump shift. Also note that splinter raises and other conventions are typically off in competition.

Vulnerability Edit

As will all preempts, vulnerability is important to consider. With unfavorable vulnerability, do not make a weak jump shift without decent suit texture. That is, with a hand like

Q5
J96
976432
J8

it is very dangerous to jump shift in diamonds. If opponents have a majority of the points and most of the diamond honors, a doubled contract can easily go down 3 or more.

See Also Edit

External Links Edit

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