Encountered the same problem yey again when on top side control: the guy would bench press me to create space and sometimes even slide their knee inside. A possible solution would be.knee on belly.
Sweeped controlled and submitted a new one and a big one stripe dude as well. He kinda pissed me off as he was continuously trying to choke me when it wasnt oworkng. Got him in side and tooled him a bit. Submitted him once.
Bear hug from behind
Side control escApe to sweep.