Very interesting thread and I was wondering the same thing. OTB vs Internet chess.
OTB chess vs Internet chess

One big difference for OTB vs. correspondence chess online: in OTB you can not move pieces when you analyze the position.
Which is huge difference for me. In correspondence chess online I sometimes analyze 5-6 moves deep rather easy using Analysis board. While in OTB I feel my chess calculation is not more than 3-4 moves (6-8 ply) deep.
Also in correspondence chess I can play "by-the-book" opening moves up to move 12-18! While in OTB one of the players exits "the book" on move 8-10. In fact I had one game on iccf where book exit was on move 21. I guess me and my opponent had the same book.
That's so true about being able to or not being able to move the chess piece when it's your move. I just made that realization.
I'm trying not to move the piece on the Internet because we wouldn't be able to do that, then analyze it, OTB. So why build a habit or analysis based on moving the piece? I want to learn to be able to analyze my next move by observation
One of my chess club advisors sometimes discourages moving the piece(s) around OTB too when we're learning. He says do it in your head. I agree.

I learned to play chess online about 6 months ago. I only have about 10 obt games under my belt and I ind it very difficult to visualize and to find strong moves, which I am able to see online. It's very frustrating because I would really like to get better otb.
Ik I'm kind of late to this discussion but... why not just screenshare and skype the professional games? Or is that already done? It's not like people can screen cheat in chess because both players are omnicient of the game.

i find it really difficult playing the otb tournaments because iam playing the internet chess the whole time . may be because of the 3d view so is there anyway i can able to do well kindly help me.

My blitz chess otb is far worse than online; online my level isn't far off from 2000 but otb I'm 1700 at best. I don't know what it is.. I guess it's a spacial thing which gets to me. Strategically I'm a lot worse, I make blunders I never make online and my concentration level decreases rapidly. I also find that I get dizzy kind of like car sickness. It's very frustrating and I hope to rectify this soon.

Today I played first OTB tournament. It was a rapid with chilidren and their parents. Well I was almost crushed. I made mistakes I forgotten when I made such online. It is harder to calculate, and to see the threats because of bad vision of the board. It look like It is needed a wide period of adoption to start playing better OTB.

I personally faced a strange issue a few years back when I was almost exclusively playing on the internet. I was very used to the 2D layout of the board, and was missing the 3D perpective of a real board. I realized it was difficult for me to see the whole picture happening on the board, and sometimes I dropped pieces in a very absurd way. I couldn't properly "see" the entire board, let's say. Kind of weird and scary at the same time. I was so demotivated.
I have to say I was plaiyng way too much on the internet and nothing OTB. I just leveled out both, and everything went back to normal.

Just my .02
Online chess is a convienence, while OTB chess is great!
The internet has given us the ability to play at anytime with anyone in the world, and that is pretty cool. But nothing beats face to face chess. getting together with friend, or a bunch of players after the club meets at Dennys. etc, and playing til sun the comes up.

I first started playing internet chess in 1996, joining ICC at that time. Until that time I had only played otb chess and postal chess. I now have met a few people who have played chess on the internet but never otb! Are you one of them? I would like to kickoff discussions concerning the pros and cons of both. I quit postal chess in the early 90s when it became a contest to see who had the stronger program. :-(
Postal chess is ridiculous and pathetic. Where is the fun in using an engine instead of our own brain?
I always imagine those correspondence players sitting there in their rocking chair looking through their monocle to see what move their super-engine has to offer while eating some cheese and sipping on a glass of cabernet sauvignon. "uuhuum, that move looks good, houdini101. Good job! Phew, this was so exhausting. I think I need more whine and a 10-year vacation on hawaii until my next move to recover from all the stress"

I don't mind my opponent farting when playing internet chess. Whereas in OTB chess it really disturbs my concentration if I were to hear or smell my opponent's fart.
I only started playing otb recently. I think these issues of getting oriented to the board, etc. are quite superficial, since one adapts to it quickly. I think you sort of retain a mental image of the board when you are calculating (obviously). So in a sense, even real chess is slightly blindfold. But of course, it takes some getting used to.
I agree with the comments made above. Internet Chess is generally 'fast'. So superficial often wins. It is also hard to concentrate in longer games in the internet for some reason (or maybe not). The closes that comes to otb is the teamleague games in FICS. Generally speaking, the quality of internet games doesn't match otb. With more time, one can actually go about seeking the 'truth' rather than to browbeat someone with an unsound attack. And it is particularly important to be able to get an all round feel for pieces in order to weigh in minute shifts in the defensive formation - which needs a lot of focus and time. With more time, one is able to think of the right sequence of moves to anticipate or refute attacks.
I am a far better player otb than in the internet. Yet, the breadth comes from playing internet games, sort of like a test bed for experimentation.