Saturday, August 08, 2009

Gazzilli

I haven't posted anything on Gazzilli before. It's one of my favorite conventions which occurs when the auction starts 1M-1NT or 1-1. It's a very simple convention with big advantages, few disadvantages, and it comes up frequently.

A 2 rebid from opener is a 2-way bid, showing one of 2 hand types:
- 16+HCP, any distribution
- <16HCP, natural (or semi-natural if that fits your system)

Responder has only 1 strong response: 2 shows 8+HCP, any distribution. Any other bid shows less than 8HCP and is natural. In this case a preference should be given to a doubleton Major support.

Opener will now clarify which hand type he's holding:
- After 1M-1/NT-2-2, opener rebids 2M with the weak version. Any other bid shows 16+HCP and makes the auction GF. Bidding 2OM usually shows a 3 card suit, which makes finding 5-3 and 6-2 fits a lot easier.
- After any weak bid, opener will usually pass with the weak version. With 16-17HCP and misfit he'll also pass. With a very strong hand he can bid a new suit. With fit he can still invite or bid game.

Basic structure after 2:
2 = 8+HCP
...2M = <16HCP, (semi)natural
...2OM = 16+HCP, any hand with 3OM
...2NT = 16+HCP, balanced, no 3OM
...3m = 16+HCP, natural, no 3OM
...3M = 16+HCP, natural, no 3OM
...3OM = 16+HCP, 4OM
2M = <8HCP, 2-3M
2OM = <8HCP, natural, 0-1M
2NT = <8HCP, minors, 0-1M
3m = <8HCP, natural, 0-1M

There are some specific exceptions:
1-1NT-2-2 = <8HCP, 3 (1NT already denied 4) and both minors (5530 or 5431).
1-1NT-2-2-2 = 16+HCP, 4 (showing 3 is useless).

Obviously you can modify this structure a bit, for example use 1-1NT-2-2-2 to show 3-4. As a result, 1-1NT-2-2-3 will now show 5.
You can also use 1M-1NT-2-2-2OM as various handtypes (this saves space!).
If you play Kaplan inversion, it also has implications to rebidding 2OM after a 1 opening.

As usual there are a few (pretty rare) problem hands: <8HCP with 1=4=4=4 and the auction starts 1-1NT-2. Usually it's best to just bid 2 and hope for the best. Another one is after 1-1, when responder has a strong hand you may have some difficulties.

Playing Gazzilli frees up a few rebids for opener:
- Jump rebids (like 1M-1NT-3m) show a 5-5 with 2 great suits but less than 16HCP. If responder has honours in both suits, 4M in a 5-2 fit can be possible. A typical example is AKxxx-AQxxx opposite Qx-Kxx. 10 tricks are for the taking if both suits behave a little bit.
- 1-1NT-2 shows a minimum hand with 6-5.
- 1M-1NT-2NT: you can use this to show a GF hand with 6M-4m. Since these are difficult to bid anyway, you might as well make it easy using this tool.

In my current 2/1 system we play Gazzilli. The weak version can be with only 2s (5M332 or 4=5=2=2) because we prefer to have our 2 rebid natural with 4+ cards. Only exception we have to the 2 rebid is when we have 4=5=3=1 exactly. Playing 2 or 3 is acceptable since we have true ruffing value.

8 comments:

Nigel Kearney said...

I understand playing it as strong or clubs, but once you add in weak 5332 shapes it seems as though clubs will just get lost, e.g.:

xxx AKxxx x AKxx
opposite
Axx Qx xxx Qxxxx

1H-1NT-2C-2D-2H-P

Both hands could even be a bit stronger and bid the same way.

Free said...

With a semi forcing or forcing 1NT response, you can indeed get these problems. You're obligated to bid something with 14-15HCP in case partner has an invite. We've chosen to bid our Diamonds naturally at the cost of Clubs.

If you decide to let opener rebid Diamonds on a 3 card suit, then you still show only 3+ Clubs. So with Axx-Qx-xxx-Qxxxx (a balanced minimum with defensive values) opposite 12-15 with 3+C, you'll still prefer to play 2M instead of bidding 3C imo.

Notice on the other hand that when we hold xxx-AKxxx-AKxx-x opposite Axx-Qx-Qxxxx-xxx and the auction starts 1H-1NT-2D, it's useful to know that opener has 4+D.

René de Milliano said...

Just a remark: playing a weak 1NT (11-14, no singleton) a forcing NT-answer loses most of its disadvantages because a weak opener must have a singleton (or a 6-card major)! I am having a lot of fun fitting this in with a forcing NT with a maximum of 2 cards for openers suit, the 2-over-1 being 7+ points and 3 card support (Drury in any position and any color). René de Milliano, Amsterdam.

René de Milliano said...

Just a remark: playing a weak 1NT (11-14, no singleton) a forcing NT-answer loses most of its disadvantages because a weak opener must have a singleton (or a 6-card major)! I am having a lot of fun fitting this in with a forcing NT with a maximum of 2 cards for openers suit, the 2-over-1 being 7+ points and 3 card support (Drury in any position and any color).

IgNoble said...

After auction goes 1S-1NT-2C, what do you do with 5-8 HCP and 1453/1435 hands?

IgNoble said...

Playing Forcing NT, what do you do after 1S-1NT-2C with 1453/1435 hands?

Free said...

With 8HCP we bid 2D. With less than 6HCP you can better pass 1S. So there are only the hands with 6-7HCP left.

With these 6-7HCP hands we bid either 3m, 2NT or even 2H, depending on which minor we hold and according to suit quality. It's safe to say that with a good 5 card C we always bid 3C, expecting partner to have at least a doubleton support (and usually more).

If opener has 16-17 and responder 6-7 there's a possibility to end up in a poor contract, but that's quite rare.

Naoto Matsumoto said...

I studied gazzilli,very good,but
too complicated.
So I designed 'Hisa'
(transfer rebid with G-tast)

(1M-3Cor3D:3M,LR)
1M-1N-pass:11-12,(semi)bal.
-2C:4+D/13+,bal./16+,5M&4C
-2M:5M&4+C,11-15
-2D:(1H)6+H (1S)4+H
-2H:(1H)'2M'(1S)6+S
-2S:(1H)reverse(1S)'2M'
-2N:16+,5-5/5440(C=void)
-3C:16+,5440(D=void)
-3D:16+,5440(OM=void)
-3H:FG,7+M,ask cuebid
-3S/3N:18+,6M&4C/D
1M-1N-2C(D orBAL...)
-2D=1M-1N-2D-p
-other:same after 1M-1N-2D
1H-1N-2N-3C(R)-3D/3H/3S:4540/5C/5D
1S-1N-2N-3C(R)
-3D/3H/3S/3N:5440/5C/D/H

very easy to remenber
and rich-Gazzilli-tast