Different between 1400+/1500+/1600+

i'm currrently on 1430...

what differ me against those 1500+ 1600+ 1700+ player..

In b4 "100 and 200 rating points ^_^ "

Basically, those under 1400 still make tactical mistakes and need to work on eliminating blunders from their play.  At 1500 it's generally more about learning strategic principles and losses there are more about positional oversights and sometimes harder to see tactical shots.  Also, endgame technique here is important.  At 1600 people can still draw won positions, so learning technique from sources such as Fritz Technique Trainer is important.  At 1600 you should know all basic tactical themes and can solve most intermediate tactical puzzles, but still have holes in your chess understanding, mostly certain strategic themes. 

Chessbooks also suggests that "beginner" (or low rated) players should play classical openings, because you'll learn things such as open center, Carlsbad center, etc.  So expect people at this level to know long lines in the Ruy Lopez, Orthodox variation, etc., and just play the openings you actually enjoy playing (as long as they're sound, so no wing gambit vs. the Sicilian for you!)

Unfortunately (I say that honestly) there is no special formula for making a certain rating.  Outside of some of the best players around, there are many ways to achieve different ranks... and most of us amateurs have gaping holes in our play.

This means one player may make 1500 with his attacking style even though his endgames are terrible while another makes trades at every opportunity and tries to win the endgame.

These cases exist (although they may be extreme).  The most reliable answer to your question is the same as what generally separates all rating groups.  Those above you tend to see a few more tactics, know a few more opening moves, have a bit better judgement in assessing a position, better endgames, etc.

The most reliable way to improve your rank is to pick your most deficient area (opening, middlegame, endgame), or your most common errors (tactical, strategy, defense, attack, time management...) and focus your learning efforts on that area.  Your weakest ability is what holds you back the most.

Although, those of us far away from master will improve really almost no matter what we study.  Do some tactical drills every day and work through a chess book a little bit each day.  Be patient, your results wont improve immediately, but this will also make you better.

less mistakes

lame right?

i always tend to play someone higher than me...

at this point..well still don't know much bout opening knowledge..its too many.. 

i don't think playing a lot of game will help me improve..

Vivinsky is spot on. Number of tactical mistakes and how big they are is the most important difference. More knowledge and understanding helps also of cource. Play slower = longer time controls, and spend some time after each game to understand and decide what to do or don't next time.

Do not worry about opening theory; develop your pieces, fight for the center and protect your king.

Good luck!

Well, I'm no math whiz, but...

Great question. I was wondering this myself today. Wafflemaster's answer is interesting and I can see how that works out. I suspect that avoidance of habitual blunders makes a big difference in separating the 1400-1600 as well.

But then, it all depends on what you consider to be a "blunder."  Different levels of players have different definitions.

Yes, yes sure. I see a blunder at my level as giving my opponent a free piece or some such significant oversight which should lose the game shortly. I'm not talking about losing protection of the b4 square or some such ting. It's like when you think you have played a decent game and you run a computer analysis and it comes back 5 blunders and you think jesus I'm not even good enough to call myself a patzer!

The awesome thing about this level of play is that with each new thing you learn it will translate into your rating going higher.  When you lose a game you had achieved a won or equal position in go back over it.  A big part of getting better rated at this level is learning just when in fact you do have the upper hand and then using your skills to keep it.  You are going to need a few more openings and if you are playing pet opens or defenses you may have to drop them or adapt to what is required of your opponent.   

By now you should know when that bishop scarifice will yield mate or just cost you a piece.  And if you are playing online chess, treat each and every move like you would tactics trainer here on chess.com.  

Good luck in your pursuit!

You'll reach the 1700s in no time then =) If you were away from competitive chess for years and studied since then you're very likely not going to have your rating reflect your skill level.  Of course, if you're active and 1300s it's because you play like a 1300 (no offense if this is the case). 

from now on...will be off from online game for a while..

study..study..study...  =D