Cheating

Hey guys,

I was playing a guy  and it was clear he was using another device to play for him. What can I do to stop this? Btw his rating was 900 and he was playing like a pro, id previously played him and won easily so there's no way he could have made that big of an improvement in just two day...thanks

No naming and shaming allowed. Mod.

EDIT! 

I saw the game, and he just dropped his queen. He was playing really passive, and I wouldn't imagining this guy being a grandmaster.

I'd report it!

I was the one who got my queen trapped actually his queen was tucked away safely

That would be cool if he really did improve that much in 2 days!

Compare his past games to this one...major improvement and he performed several reveal moves which at his level couldnt even be possible

First game on the post happened before the other one.

What?