Gazzilli simplifies awkward jump shift decisions
Those awkward decisions
Bridge is full of awkward decisions. Hand evaluation often ends up exactly in between two (or more) possible actions. With the Modern American system, we try to predetermine or eliminate those border cases as much as possible.
One frequent problem is that after you open 1 of a major and your partner makes a 1-level response (e.g., 1♥-1NT, 1♠-1NT, and 1♥-1♠), and you have more than a minimal (12-15 HCP) opening hand.
One thing that eases our pain versus the 2/1 system bidders is that we have adopted the response 1NT as 6-9 HCP and no support for the major. When the open was 1♥, the 1NT also denies 4 spades — saving us from having to try show 5-4 shape hand with a 2♠ pseudo reverse.
The next convention we adopted to help us is the Gazilli 2♣ rebid. This allows the opener to make a forcing bid and have the responder further describe their hand. The full Gazzilli convention and articles about it are described on the convention page. But in short, after the opener rebids 2♣, the responder will make the minimum response of 2♦ to indicate they responded with < 8 HCP. Any other bid shows 8 or more.
Consider if you pick up this hand:
And, after you open 1♠, your partner bids 1NT (remember 6-9 non-forcing)
Do you bid 2♥ or 3♥? If you only bid 2♥, you might die there when you had a makeable game contract opposite even 8 HCP from responder. On the other hand, if you jump to 3♥ and your partner was obligated to bid with a minimal 6 (or even 5) HCP, the 3-level may be your doom in the field. Until the ACBL allows the option to bid 2 ½ hearts, you are on the horns of a dilemma.
Not so much if you play Gazilli. It allows you to ask your partner which part of the 1NT range they responded with. If you hear 2♦ from them, you can bid 2♥ and give them the option to pass or correct to spades. If they show points and hearts, you can drive to the game. If they claim points and spades (2 of them), they have denied 4 hearts so that you can turn your gaze toward a 3NT contract.
Let's take a look at the full deal:
And the auction has been 1♠-1NT; 2♣-2♦; 2♥-all pass;
You might have been successful in playing 3♥s. You have two definite losers in the trump suit. You have a diamond loser to play around, plus the K
has to be on the correct side — which it isn't. Many pairs will be in 4♥ when the South jumps to 3♥ to try showing the 17+ point hand.
Another advantage to the Gazzilli is that now, when you make a jump shift in hearts in this auction, you are tightly limiting your hand to 15-16 HCP. The inference is that you decided not to use Gazzilli. That implies not enough HCP; it also can hint that you are a 5-5 shape hand (distribution values), and your partner can be more scientific in their decision to pass, correct, or raise. They also won't be tempted to bid 3NT over your jump shift.
Pairs using natural systems are faced with an uncomfortably wide range of hand &emdash; when making a non-jump shift. It could be a very shapely 11 HCP hand up to 17 HCP with a flatish 5-4 shape hand. How can your partner decide with 8 or even 9 HCP to pass or raise?
And, if you Jump Shift with a slightly shaded valuation, you may force the auction to game with a weak hand from your partner; they are only human and like to accept invitations whenever tempted. Worse, in 2/1 with forcing NT. You have to be savvy that your partner may actually hold a limit raise in your opening suit, bidding their time to jump respond. This wide range might tempt them to pursue slam when you weren't intending to be there (or safe there).
When you guess wrong, you blame the system, but you don't have to. Pick a better system.