Flux

It can be, but, you don't need to actually know what you're talking about, sound like you know, paraphrase never have the spcifcis. Example, The Crimson Knight is waaaaaaay fucking better than me at chess. However, can you say in those scenes that were in Clash that he didn't sound like a master? I never even once showed what he was exactly doing, I just described it in a way that conveyed his brilliance.

Basically, be smart about looking like your smart. In fact, not explaining entirely can work in your favor. Because the reader might not understand it as much as you, so... if you make it a blur or something another character can;t understand jsut looking at it, it might jsut add to the "how the hell did he do that?" factor which clearly makes it look like he's so intelligent they can;t understand what he just did. One doesn't have to be highly intelligent to write a character...

Pretty much everything hukuna said. You just need to exploit the suspension of disbelief and BS your way through it without trying to hard to actually explain in intricate detail dafuq they're doing or talking about. This is the type of sections where alot of descriptive/poetic language comes in handy for keeping the focus off of WHAT exactly the character is doing, and instead put it on HOW they are doing it and HOW the narration and other characters perceive it.

also, another...