Not honest opponents

Hi! How to determine that the opponent takes clues from a chess program?

there are several ways to determine if your opponent is using a engine. 

1. Look at his game history and his record (42 wins, 1 draw) and his rating 2139

2. Look how new his account is, remember this site does ban cheaters, but if their account is new, they just haven't gotten around to it yet.

3. Engine users usually spend the same time on move

At that level of play there is no cheaters, don't worry.
Even a basic smartphone app reaches 2000 strength or so. 

I think. some play close to holding a smartphone and play.
Too thoughtful moves some opponents for their level.

Not trying to sound like a prick, but at our level we can't even decide what a thoughtful move is.

I often play with the computer and with strong players and not a lot can be judged about far-sighted moves