unfair

everyday I use tactic trainings puzzle. everything is good except grading sistem. when I find very complicated solution it gives me 3-8 points. however it subtract 9-10 points when I make incorrect move.

I confirm nothing!

You do realize that the only purpose of a TT rating is to give you puzzles appropriate for your skill level, right?  At 1865 I'd say you're doing just fine, but if doing the puzzles rated is annoying you, then kick over to V3 (Try the new Chess.com at the bottom of the page).  In custom (unrated) mode, you can practice puzzles of a particular motif or even choose just to practice puzzles you've previously missed.

baddogno, thanks for comment.

I will keep playing TT anyway. I really dont care about rating. I just found it unfair. That`s all.