@1
It is psychological.
Say you are a 800 rated player and you play a 1100 rated player.
You expect to lose, resolve to sell your skin dearly, pay close attention, take time to think, blunder check before you move... and win.
Say you are an 1100 rated player and you play an 800 rated player.
You expect to win easily, relax, play carelessly and fast, make a blunder, and lose.
So I feel like the rating range 800-1200 are the same skill, and here why I think so.
Right now I am 1100. I am going against mostly 900 to 1200 rated players, but some of the 900-1000 rated players are better than the 1100-1200 players. I have even played against 800s and some of them were better than the average rating I go against, which is the rating range 1000-1100. I just don’t understand why this is! Can anyone explain why?