~Weak or Strong Jump Shifts

In the June, 2009 issue of Bridge Bulletin, Mike Lawrence stated a case for strong jump shifts with certain specific type hands:
~Good hands with a terrific suit (two types)
~Strong hand with a fit
~Strong balanced hand with a good suit
For the first example, Lawrence chose to differentiate in the bidding between these two hands:
~S AKQT7432 H 84 D Q2 C J
Bidding:
Partner You
1C 2S
2NT 4S
Lawrence advocated this bidding sequence (jumping in your suit twice) as showing a solid suit without any useful side suit control. He stated that if you bid 1S and then jump to 4S, the sequence shows a good but non-solid suit. He further suggests that the sequence
Partner You
1D 2H
2NT 3H
shows an excellent but not absolutely solid suit with slam interest (therefore, side suit controls as well, something like
S K3 H AQJT876 D 3 C K98
In example two (strong hand with a fit) Lawrence shows this type hand:
Partner You
1C 2S
2NT 3C
Lawrence suggests this sequence show a hand such as
S AQJ84 H 4 D A8 C KT964

It stands to reason then that if the bidding went
Partner You
1C 1S
1NT 2C
the sequence would show club support but less than 10 HCP due to the failure to bid 2D (NMF) on the second bid. With 10+ HCP, you would first bid 2D to ask about opener’s heart and/or spade holding and to invite game. If opener then bid anything except spades (or game or above) at this time, you would next show your club support.
In example three (strong balanced hand with a good fit), Lawrence suggests that responder should hold something like
S QJ8 H KQT87 D K3 C AKJ
for this bidding sequence:
Partner You
1C 2H
2NT 3NT
Note than in each of the examples, Partner has opened at the 1-level, you jumped in a higher-ranking major suit, and opener then bid 2NT. The 2NT bid just asks you to further explain which type hand you held.
In recommending weak or strong jump shifts (WJS or SJS), Lawrence feels strongly both ways! He stated that, “when they come up, SJS are superior to any other scientific approach you might devise.” He goes on to say that ”waiting for one of these hands to come up is tedious.”

About WJS, Lawrence said, “I find the weak jump shift has value in obstructing the opponents’ bidding.”
His final suggestion was, “Choose strong or weak jump shifts and be comfortable you are doing something good.”

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