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TURBO, perhaps the most undervalued convention in bridge.

Turbo in simple words is a convention to show keycards when fit established at 3-level or earlier and q-bids started and continued up to 4NT. The first who bids 4NT does not ask for keycards but simply shows on even number of keycards (0 or 2 or 4). Bypassing 4NT and bid at the 5-level shows an odd number of keycards (1 or 3 or 5).

Something that is completely unknown is the usefulness of the TURBO convention in competitive bidding. Consider the following amazing hand and see how would you have bid with your own methods.

West
10962
7
KQJ1075
65
North
A853
AKJ52
A
AJ4
East
QJ74
3
9642
10873
South
K
Q109864
83
KQ92
W
N
E
S
3
X
5
5
P
6
P
7
P
P
P
D
7 South
NS: 0 EW: 0

What happened here? Did they know what they did or it was just luck? Let’s see what N/S did:5 showed a decent hand at least 10 hcp with some controls with at most one key-card and without diamond control (otherwise he could have passed). North knew that 6 was cold but what kind of information should have to give to South in order to bid the grand? He should have informed his partner that he held all key-cards and fit has been found. How could he do that? But, simply by using the TURBO convention! 5NT over 5 would have shown even key-cards (in that case four) and control in diamonds. Therefore 6 showed odd key-cards i.e. five for sure! and fit in hearts Now it was easy for South to count 13 tricks. It should be noted that 5 or 6 by North over 5 would have not been a cue-bid but natural.

The above is an excerpt from the essay "The TURBO Convention" which you can download from https://dl.dropboxusercontent.com/u/64932460/TURBO-2016.11.01S.pdf

 Your comments and suggestions are welcome.

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