[cloa513]

I dont think it is a lotbetter since it comes up more often consuming budding space. Either make for example 3H reponse after 1S opening a weak bid or leace it undefined and unused.

[pilowsky]

GIB is incapable of change. It's a Terminator (and not one of the new models). - These notes correspond to GIB version 40, deployed Feb 14, 2019. https://www.bridgeba...ystem_notes.php

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Soloway Jump Shifts
GIB plays Soloway Strong Jump Shifts by an unpassed hand in uncontested auctions. A jump shift shows one of the following types of hands:

• Strong rebiddable suit, 17+ total points, 4+ controls (A=2, K=1), no side 4-card suit
• Solid suit, 17+ total points, 4+ controls, may have a side 4-card suit
• Rebiddable suit, 18+ HCP, 4+ controls, 5332 or 6322 shape.
• Rebiddable suit, 17+ total points, 4+ controls, 4-card support for opener's suit

<br style="font-family: Verdana, serif; font-size: 13.3333px;">Strong jump shifts are only from the 1 level to a higher suit on the 2 level. Jumps to a lower suit on the 3 level are natural and invitational.

<br style="font-family: Verdana, serif; font-size: 13.3333px;">Opener can rebid his suit to show 6+, raise responder or bid RKC Blackwood with 3+ support, bid a side suit to deny support and show least KQ in the suit, or bid NT at the cheapest level to show any other hand.




Jump shifter shows which type of hand it had with its next bid:

• With types 1 or 2, it rebids its suit, jumping to game with a minimum and solid suit (note that it never shows the side suit in type 2).
• With type 3, it bids NT or raises NT to game.
• With type 4, it raises opener's suit with no side shortness, or bids its short suit (this is why it can never show its own side suit – a new suit is a splinter in support of opener).

[smerriman]

cloa513, on 2020-July-08, 03:01, said:

I dont think it is a lotbetter since it comes up more often consuming budding space. Either make for example 3H reponse after 1S opening a weak bid or leace it undefined and unused.

It changed in version 39

Invitational jump shifts are part of Bridge World Standard, so the convention itself is a good one - GIB's usage of it, like many other things, is awful.

[johnu]

pilowsky, on 2020-July-08, 03:10, said:

GIB is incapable of change. It's a Terminator (and not one of the new models). - [size="2"]These notes correspond to GIB version 40, deployed Feb 14, 2019. https://www.bridgeba...ystem_notes.php

It is easy to miss, but this is from that document

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Strong jump shifts are only from the 1 level to a higher suit on the 2 level. Jumps to a lower suit on the 3 level are natural and invitational.