drawing against 2000’s, losing to 600’s

The brain has a funny way of working. Against higher rated players it feels like you absolutely have to play your best. Against lower rated players you're conditioned to believe "just a matter of time till I win", so you play quickly, then relax and wait for your opponent to make major blunders. And if they don't happen?

Low rated opponent. Will be easy. Low concentration. Error. Loss.
High rated opponent. Will be hard. High concentration. Opponent errs. Win.

The time control that you choose also plays a factor. Those games against the 1400 and 2000 players that you were talking about were a slower time control than what you have been playing recently.

As it has been pointed out, the rating difference can affect how well one focuses and the style of game one plays. Opponents might be willing to take more risks or get into dangerous positions against lower rated opponents. On the flip slide, lower rated opponents might choose solid openings or play passively against significantly higher rated opponents.

Along with this, bear in mind that you've only played a handful of games, so the sample of games is small. In the long run, when you play a lot of games, you will lose on average a lot more against higher rated people than lower rated people.

Edit: Against the same 2 000+ rated opponent you have a draw and 6 losses, so you can't really say that is a better result than against 800 rated people. You have 3 wins and 3 losses against under 1000 people.

No offense of any kind intended, but a 800- rated player drawing against a 2000 rated player in a normal game is so enormously unlikely that I suspect the latter was just taking it easy and extremely casually, perhaps even not paying much attention to the game and doing other stuff on the side, perhaps not even minding doing some bad moves. Or something along those lines.

As for the other situation, everything under 1000 is quite a wild west, I would say. People's actual playing strength is very erratic, sometimes they find excellent moves, sometimes they make absolute beginner mistakes which cost them the game. They still don't, for the most part, have the experience to play relatively good moves and avoiding easy mistakes consistently, and thus they make occasionally the easy blunder and lose the game.

One of the biggest hurdles in my experience is getting over that threshold where you stop missing obvious mistakes and making beginner blunders (and start more easily seeing your opponent's easy blunders). That's when your rating starts growing from below 1000 to well over it. About the only way to get to this point is to play a lot of games.

I play unrated chess and I'm 1200 in blitz. The same thing happens to me, like how do I lose against a lot of 1100s but I win against a 1900 with the computer saying I play like a 2350?

I agree! I am beating 1900's here on chess.com, but this 1300 guy in my chess club keeps making me blunder. When I play him next time, I am going to pretend he is a 2400.

I wouldn't say passively, but definitely conservatively. Some lad pops up with a rating 100 elo above me, I definitely go on high alert. (wtf chess.com?) That said I usually lose those games, or almost win, then blunder something. At least I know when it's happening. Progress!

Dear sir/madam/ser:

Please take another down vote with my compliments. Don't worry, the attendant report comes at no extra charge.

Have a grand day.

Regards,

Someone on the Internet

Higher rated players, no pressure so nothing to lose, lower rated players it's the opposite, so it affects performance differently.