~Jump Shift Bids by Responder
In his methods, the 2H jump shift over partner’s 1D opener would show about 3-5 HCP and a heart suit of 6+ cards. The bid would say to partner, “I am weak and cannot help you in this contract unless hearts are trumps.”
Since Mr. Hardy first published his 2/1 texts, other bridge professionals have advocated that jump shifts by responder be played as invitational, about 10-12 HCP and a good 5-card or 6-card suit. Other bridge professionals have retained the jump shift by responder as a game force.
When the opponents have no bid, weak jump shifts must be alerted. In competition, weak jump shifts are standard.
You and partner must pick your methodology for a jump shift by responder.
I like the preemptive quality of the Weak Jump Shift by responder. I can see specific hands where strong or invitational jump shifts keep the competition out of the bidding; however, the availability of other forcing bids (New Minor Forcing, Fourth Suit Forcing, Reverses, Cue-bid Limit Raises, Inverted Minors, etc.) lead me to play the jump shift as weak so as to limit the bidding space of the opponents).