IQ fixed?

a lot say that a relative high IQ, talent and hard work is necessary to become a good chess player.

so my question is:

is IQ a fixed number given at birth or can you actually increase your IQ by brain training?

eg. 2 4 6 8 next number__ ....= 10

ok this example is too easy but you get the picture

I don't think IQ is fixed a birth, otherwise newborn babies would be as intelligent as fully grown adults.  This is not observed to be the case. 

Intelligence seems to vary with age (and alcohol consumption) so it makes little sense to talk about it being a fixed quotient.  Certainly you can do an IQ test which will yield a specific figure, but that only tells you your intelligence on that particular day and for that particular set of questions.  Humans are not machines, and are susceptible to such factors as distraction, illness, fatigue, and Glenfiddich.  

So yes, IQ is a factor in chess ability, but it is somewhat variable, and it certainly not the only (or the deciding) factor. 

you have a point however some chrildren can do math and more at 5 years old. 

I think our IQ is based on our genes however as few train our brain few show their full pontential.

grandmasters are forced to work hard and use a higher percentage of their potential.

also can you really do an IQ test more than once?

first time you see this

2 4 6 8 ____ next number 10   you are actually using your brain to connect the dots next time you see it you rely on your past experience to solve it.

you know the pattern to solve it al ready. (+2)

I got an answer from one of my purchased brain trainer apps that says the neuroplacity in the brain will continue to grow so it is possible to become more clever by training.

I actually had the best score in tt at the time I was addicted to solving Sudoko.