I am not sure that all of these are conventions in the strictest sense of the word.
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I think it is moot whether this is a convention. IMO according to the definition of conventions in the laws willingness to play in the last named denomination makes a bid non-conventional.
Gambling 3NT may not be a good convention but is there a better use for 3NT.
This reminds me of another useless convention:
Playing Precision the Unusual Negative convention where on the auction
1
♣ 1
♦
1
♦ shows either a weak hand (0-7) or a strong hand (8+) with a 4441.
I recently exploited the weakness of this method unintentionally using the aforementioned dreaded gambling 3NT. I was dealt 8 diamonds AKQJ10 and the bidding went:
1
♣ P 1
♦ ? to me
I bid 3NT and LHO doubled. In a moment of confusion my partner forgot to pull with her Yarborough (maybe a 10 or a Jack somewhere). I was booked for down 9 which if the outstanding diamonds had been 2-0 might have been only a small loss against 7
♠ (-2300 vs -2210). Alas they were 1-1 but LHO not imagining the 8+ variation thought he was endplayed and eventually lead a diamond for me so that he would get two and not only one of the remaining tricks. I had helped him along by pitching some of my "good" diamonds and keeping some worthless clubs as if I had a guarded stopper.
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[*]Equal level conversion
[*]Weak jump shift not in competition.
Not sure these are conventions - weak jump shifts certainly are not.
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[*]Unusual 2NT (not the convention per se, but its most common application).
[*]Strong 2C opening.
[*]Any convention that gives controls before distribution at the first round of bidding (without a known fit).
2NT - I agree
2
♣ a necessary evil I feel.
Control showing early maybe back to front but some palooka Italians won many world championships with this method.
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[*]Free negative bids (no pun intended, FREE !
![:lol:](http://www.bridgebase.com/forums/public/style_emoticons/default/tongue.gif)
).
Not conventional. Consider that if these are conventional then natural forcing must be conventional as the only difference is range.
Negative Free Bids (I assume this is what you mean) are currently one of my favourite toys.
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[*] Use of negative doubles as "card showing", with little distributional info (e.g. generic 8-11, usually balanced, regardless of majors).
At lower levels this may be so. At higher levels this is how to play negative doubles in my opinion. Catering your bidding to finding an elusive four-four fit after the opponents have pre-empted is a big loser IMO. When you find it you do not know whether you want to be there - bad breaks and all.