Class A player, how many hours to become one?

THE SECOND ONE!Karjakin had a 2200 elo when he was 10-11!

I was 18 when I started playing (and 19 when I played in my first tournament).  I disagree.  Not hanging stuff (well, by which I mean to obvious tactics.  Deep/tricky ones sometimes can't be avoided) and knowing the openings that you play decently will get you to to at least 1700. 

I suppose 18 is an adult.  I don't think it's practical for the OP to go about it this way though i.e. "just don't blunder."  I certainly don't think he'll be 1800 in "an year" or by his "third tournament."

It would be interesting though if he did intensive tactics training a la De La Mesa and reported back to us.

How do they know the brain becoming more rigid with age is due to age and not environment? I imagine it's difficult to find a large sample of healthy adults who have zero responsibility in life.

2 hours, 15 minutes.

I think this is largely true. My studying has been limited to tactics, endgames, and reviewing master games. My games have been decided by tactics so far.

+10 years for me.

For example after growing up, feral kids can't learn language.

http://en.wikipedia.org/wiki/Victor_of_Aveyron

JohnCh1234 hat geschrieben

THE SECOND ONE!Karjakin had a 2200 elo when he was 10-11!

What I am saying now is no joke, I know somebody who can really beat Carlsen one day. He is 9 (!) years old and has a Fide rating over 2100. He could be the youngest grandmaster of all times. I know him because he lives near by my city and we have lots of IM and GM training together.

That's if you're rated 1784, playing against someone close to your rating, and the time control is G/70.

They say now, that the old brain is more elastic than they used to think.

Good to hear!

Does "elastic" mean you're more likely to snap?

Just want to mention something about "hanging stuff".

A long time ago I was having dinner with John Nunn at some tournament. He just made an over 125 rating points jump to the world top 10. I asked him how he managed that in less than 1 year.

He answered that a year ago he started writing down his moves before playing them. Put his pen on top of what he wrote down and then started checking the position for simple stuff before playing his move.

Is anything hanging, are there any checks, do I by playing my move create a threat for the opponent that wasn't there before. Knight forks. Simple stuff like that.

It took care of all the silly mistakes. I believe he kept doing that for the rest of his impressive career.

Interesting idea! Ironically, the USCF made it illegal (I think from 2013) to write down your move before playing it!

Really? I believe that was only for electronic score sheets, to dissuade players from playing out variations on their devices.

Does FIDE allow recording of moves before making them?

See 15a, and this was made to be in line with FIDE, so this should answer Ziryab's question as well.

http://www.uschess.org/docs/gov/reports/RulebookChanges.pdf

Right. Also FIDE 8.1 It is forbidden to write the moves in advance, unless the player is claiming a draw according to Article 9.2, or 9.3 or adjourning a game according to the Guidelines of Adjourned Games point 1.a.

I do not believe the story about John Nunn.