# BBO Discussion Forums: Precison defence - BBO Discussion Forums

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## Precison defence help needed please

### #1sceptic

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Posted 2007-August-08, 09:44

Hi all

I really need to learn how to defend against precision type systems

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### #2keylime

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Posted 2007-August-08, 09:51

A good base defense that seems to be popular is Mathe:

double = majors
1NT = minors
rest of the bids = natural

I'd also discuss with pard what the meaning of these 2 sequences mean:

1C - 2H versus 1C - 1X - 1Y - 2H. Normally in expert standard, a pass then bid, shows a good playing hand versus a freebid that shows a preempt.
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### #3helene_t

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Posted 2007-August-08, 10:13

Against 1: Dbl shows clubs, notrump shows whatever two-suiters you agree on, other calls are natural and not constructive. Strong hands pass and bid in next round. After
(1)-p-(1)-p
(1N)-?
you play whatever structure you play against a 1N opening. Dbl on the 1 negative relay shows diamonds.

Against 1(if 2+ or shorter): x is t/o for the majors, might be short in clubs. 1N tends to (should?) show a diamond stopper. Diamonds by us is always natural.

Against 2: WJO. X on the 2 relay shows diamonds. 3 is michaels.

Against 2 (short ): x is a (semi)-balanced hand outside your 2N range, which is probably 17-19 or such, or a very strong flexible hand. 2M is sound and shows a very good suit. 3 is a good overcall, 3 a weak overcall.
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### #4hrothgar

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Posted 2007-August-08, 10:36

Here’s a few quick thoughts about competing against a Precision pairs. (All of this assumes that you have the luxury of playing in a regular partnership)

Your top priority should be developing effective methods to disturb the opponent’s nebulous openings. You definitely want quick in / quick out methods over the opponent’s Strong Club opening. I prefer methods that allow me make non-forcing calls at the two level. For example, I play a 2C overcall that shows a two suited hand with Clubs and Hearts. I play a 2D overcall that shows a two suited hand with Diamonds and Hearts. I use a 2M overcall that shows a single suited hand with that major. For what its worth, I think that Mathe is a dreadfuul defense. I'm happy to see folks use it against me.

You may very well want to play a modified version of the same method over the auction (1C) – P – (1D). In particular, if the opponents are using a light 1C opening and use 1D to deny a game forcing hand, the 1D response is probably overloaded. You also want to look at the opponent’s 1D opening. If they’re using a nebulous 1D opening that promises 1+ Diamonds or 0+ Diamonds this is another opportunity to jam their auctions.

The next thing that you’ll need to worry about is your competitive judgment. If you play a lot versus a Precision pair, you’re going to need to worry about lots of auctions like the following: (1H) – P – (4H). The 4H bid could show anything from a strong balanced GF hand that doesn’t feel like exploring slam to a preempt. Worse yet, an auction like (1H) – P – (3N) could show a hand that thinks they have a really good chance of making 3N or (alternatively) it could show a preemptive heart raise. The strength of a Precision type system is the limited opening bids. Good Precision pairs are going to have lots of ways to exploit this. Judgment is your best defense. Also, make damn sure you know if/when the opponents have established a forcing pass.

Probably the last thing you need to worry about are the specialized 2C and 2D opening bids. Its not too difficult defending against either of these. You just need to make sure you and your partner are on the same page.
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### #5glen

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Posted 2007-August-08, 10:43

If your defense to 1NT includes a strength showing double, one can play the same methods over the strong 1 and 2 openings. For example, Karen and I play Astro two-bids over 1NT. So over 1 we play:
Double = s and a minor
1 = s and another suit
1NT=minors
rest natural

Say one plays CAPP. It they open 2 then:
Double=one suited
2=majors
2/=major+minor
2NT=minors

If they open a strong 1 the same thing but one level lower.
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### #6MickyB

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Posted 2007-August-08, 10:52

Over 1 - aggressive jump overcalls, especially when NV, when it is unlikely you have game.

X, 1NT and possibly 1 show some kind of two-suiters. X = majors, 1NT = minors is fine; or you could try CRASH or similar (X = two suits of the same Colour, 1 = two suits of the same RAnk, 1NT = two suits of the same SHape). I like these to show 5-5 shape, as I think you should pass with 4-4 and I like to just bid my five-card suit at the two-level when I'm 5-4.

1M overcall shows a reasonable hand, interested in bidding constructively to 4M. Now 1NT = good raise

Over 1, treat it as natural, including 2 = majors. In any event, (1)-X-(P)-2 should definitely be artificial, even if you play other diamond bids as natural (you can pass 1 X with diamonds).

Treat 2 as you would a weak two.

Over a 2 opening showing a three-suiter short in diamonds, I use the popular defence to a multi, the "Dixon double" - X = 13-15 bal or any strong hand. This only works because it's unlikely that they'll decide to play in 2, so you can double on hands that it would normally be too dangerous to bid on.
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### #7cherdano

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Posted 2007-August-08, 11:11

You don't need a special defense. Just don't be afraid to overcall, pick a meaning for X/1N/2N, and maybe preempt a bit more aggressively than usual.
Some think overcalling 1M is not worth it without a good hand, since it gives them space etc., but I don't buy that, partner may be able to raise to 3M or 4M.
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### #8hrothgar

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Posted 2007-August-08, 11:20

cherdano, on Aug 8 2007, 08:11 PM, said:

You don't need a special defense. Just don't be afraid to overcall, pick a meaning for X/1N/2N, and maybe preempt a bit more aggressively than usual.
Some think overcalling 1M is not worth it without a good hand, since it gives them space etc., but I don't buy that, partner may be able to raise to 3M or 4M.

I'll echo what Arend says here: You don't need to play suction or psycho suction or whatever over thier strong club. (Simple natural bidding will work fine). The important point is to make sure that

1. You and your partner are on the same wavelength regaridng style
2. You and your partner can accurately describe your methods to the opponents

For anyone who cares, I posted my preferred overcall structure over the opponent's strong club opening a little more than a year ago. I think that its fairly well designed.

If anyone can find it, please post a link. (If folks are feeling lazy, I have it bookmarked on my home PC and might repost it tonight)
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### #9jdonn

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Posted 2007-August-08, 11:50

My advice is preempting when you can works well to kill their bidding space. Random overcalling on low levels completely hurts the overcalling side a lot more than the strong club side, who can usually judge very well at the low level. So my feelings are exactly like the first part of cherdano's post, and exactly opposite of the second part.
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### #10skjaeran

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Posted 2007-August-08, 11:59

I prefer to bid as often as possible over a big club.

At the 1-level i prefer "CRASH":
x=Colour, blacks or reds
1=RAnk, majors or minors
1NT=SHape, pointed or rounded

1M=natural, good hand, might be our hand

At the 2-level I use "Amundsen":
2= OR majors
2= OR 4-6+m
2=4-6+m
2=natural

After 2-way bids, we use the multi principle; partner bids as high as he can and is ready for correction.
Passing first and entering later (natural overcall or t/o double) shows a strong hand.
Kind regards,
Harald
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### #11cherdano

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Posted 2007-August-08, 12:04

jdonn, on Aug 8 2007, 11:50 AM, said:

My advice is preempting when you can works well to kill their bidding space. Random overcalling on low levels completely hurts the overcalling side a lot more than the strong club side, who can usually judge very well at the low level. So my feelings are exactly like the first part of cherdano's post, and exactly opposite of the second part.

I am not sure how much we disagree, I wouldn't make anything that I consider a "random overcall" over 1. But if I had a clear 1 overcall over a natural 1, I would still make the overcall over a strong club opener. Do you disagree with that?
Disclaimer: this post is not intended to offend anyone who spews constant drivel. --PhilKing
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### #12Apollo81

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Posted 2007-August-08, 13:02

You really hurt them when you can raise the auction to the three level or higher before opener gets a chance to bid again.

To me, this means overcalling and advancing normally, but relaxing your suit quality requirements for jump overcalling. The style a lot of people seem to like of frequent 4-card suit overcalls and 2-level 5 card suit overcalls is exactly the opposite of the right thing IMO since it doesn't allow advancer much liberty in jacking it up.
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### #13keylime

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Posted 2007-August-08, 13:26

I agree wholeheartedly with Noble.

Just getting the opps to have to start guessing at 2 is going to cause them problems unless they have discussed how to handle it in detail.

A surefire way to test their agreements is to float a trial balloon of sorts; i.e. come in on a relatively safe hand and make an aggressive call. If they struggle to their spot or miss it, attacking play is warranted. If tho they bid as if it never happened and get to where they need to be....you might want to have a rethink.
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### #14hrothgar

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Posted 2007-August-08, 13:27

Apollo81, on Aug 8 2007, 10:02 PM, said:

You really hurt them when you can raise the auction to the three level or higher before opener gets a chance to bid again.

To me, this means overcalling and advancing normally, but relaxing your suit quality requirements for jump overcalling. The style a lot of people seem to like of frequent 4-card suit overcalls and 2-level 5 card suit overcalls is exactly the opposite of the right thing IMO since it doesn't allow advancer much liberty in jacking it up.

Apollo81 has raised a good point: You can’t really evaluate whether a set of methods is “good” until you agree upon your goals. Its crucial to understand what your overcall system is hoping to accomplish. I also agree that if your goal is to precisely identify a nine card fit and use this knowledge to permit advancer to jack the bidding up to the three level then a fairly stodgy overcall structure where you overcall at the one level with 5 card suits and jump overcall with six card suits will work fairly well.

Personally, my design goals for an overcall structure are somewhat different:

1. I prefer methods that maximize our chance of forcing the auction to 2M or 3m. Furthermore, I prefer a structure in which the opposing side is unsure whether our 2S contract is based on a seven or an eight card fit.
2. I like two suited overcalls where advancer immediately knows both of my suits. Being the first one to discover a double fit is incredibly powerful in these types of auctions.
3. Where ever possible, I like our methods to be based on natural and non-forcing overcalls. I want to make sure that the partner of the strong club opener is under as much pressure as possible. I want him to worry that the auction is going to go 1C – (2D) – Float… and be forced to open up the range of his doubles and advances.

No system is perfect. Almost by definition, whatever meaning I chose for a 1NT or a 2NT overcall is going to violate some of these principles. Even so, I’m fairly happy with my choice of methods.
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### #15mr1303

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Posted 2007-August-08, 13:30

MickyB, on Aug 8 2007, 04:52 PM, said:

I like these to show 5-5 shape, as I think you should pass with 4-4 and I like to just bid my five-card suit at the two-level when I'm 5-4.

1M overcall shows a reasonable hand, interested in bidding constructively to 4M.

Mike, I've never seen you pass holding 4-4 in any 2 suits when I'm playing a strong club.
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### #16MickyB

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Posted 2007-August-08, 17:43

mr1303, on Aug 8 2007, 08:30 PM, said:

MickyB, on Aug 8 2007, 04:52 PM, said:

I like these to show 5-5 shape, as I think you should pass with 4-4 and I like to just bid my five-card suit at the two-level when I'm 5-4.

1M overcall shows a reasonable hand, interested in bidding constructively to 4M.

Mike, I've never seen you pass holding 4-4 in any 2 suits when I'm playing a strong club.

That's just a vote of confidence in your constructive bidding, I'm sure
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### #17MickyB

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Posted 2007-August-08, 17:49

hrothgar, on Aug 8 2007, 08:27 PM, said:

3. Where ever possible, I like our methods to be based on natural and non-forcing overcalls.  I want to make sure that the partner of the strong club opener is under as much pressure as possible.  I want him to worry that the auction is going to go 1C – (2D) – Float… and be forced to open up the range of his doubles and advances.

Agreed. Recently David_C and myself played six boards against a strong club pair who play internationally. We had three boards commence (1)-2, on

Jx xx KJxxxx xxx (this was at love all)
Q97x K ATxxx KJx (this one was at favourable opposite a passed hand)
Q AQx QJT9x QJ9x (likewise)

We seemed to score fairly well out of them.

My aims over a strong club are to get the auction to the two-level immediately or to make it likely that advancer can raise a one-level call to the three level.
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### #18hrothgar

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Posted 2007-August-08, 19:16

Here are my preferred methods. Personally, i think that this type of structure will allow you to inflict a fair amount of damage on strong club pairs

Pass = Strong or weak

X = Both majors

Typical example hands (minimum/maximum)

KJT2 QT98 73 762
AJ763 KT52 9 763

1 = Lead directing (typically a canape overcall)

92 874 KQ3 QT983
54 T87432 AQJ 63

1 = Lead directing (typically a canape overcall)

AJ72 52 QT62 763
AQJ73 74 843 K5
AJ843 K74 672 42

1N = 2 suited with Spades and a minor

AQ52 673 QT632 3
AJT62 4 52 KJ942

2 = Clubs and Hearts

7632 QJ73 4 KQ42
5 AQJ9 Q42 KQ8742

2 = Diamonds and Hearts

Q52 KT52 QT62 62
42 KJT82 AQ932 3

2 = Hearts

73 QJT642 K72 732
K4 AQT9732 73 82

2N = Clubs or Diamonds and a major

3C = Minors

4 863 KJ762 KQ73
2 63 AT572 AKT73

3 = Diamonds
3 = Majors
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### #19glen

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Posted 2007-August-08, 19:21

hrothgar, on Aug 8 2007, 08:16 PM, said:

...
1 = Lead directing (typically a canape overcall)

Typical example hands

92 874 QT853 KQ3
54 T87432 63 AQJ

Can you only "overcall" 1 over a big pass?
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### #20hrothgar

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Posted 2007-August-08, 19:28

officeglen, on Aug 9 2007, 04:21 AM, said:

hrothgar, on Aug 8 2007, 08:16 PM, said:

...
1 = Lead directing (typically a canape overcall)

Typical example hands

92 874 QT853 KQ3
54 T87432 63 AQJ

Can you only "overcall" 1 over a big pass?

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