Why ARE there brilliant moves in chess?

"a brilliant move must be quiet and not a capture or check"

• That is also the convention in problem chess: the key move is always a quiet move, never a capture or a check.

hello
What do u prefer the most :-- Win a game with 99% accuracy or have 5 brilliant moves in a game.

hii

"Win a game with 99% accuracy or have 5 brilliant moves in a game"

• Win a game. Accuracy means nothing: it is high if the opponent plays badly. Brilliant is only an aesthetic notion.

"That is also the convention in problem chess"

And why exactly must a brilliant move be based on the "convention in problem chess"?

There are many definitions of a brilliant chess move, some vastly different from others. You cannot say one is more correct compared to the others; brilliancy is subjective to the eye of the beholder (or whatever the saying is).

"why exactly must a brilliant move be based on the convention in problem chess?"

• Brilliant is an aesthetic notion. Problem chess is about aesthetics.

@tpr said ^

"Chess.com"

• This is not Chess.com.
  For a real brilliant move it is a requirement.
  Likewise in problem chess a key move is always a quiet move.
  Checks and captures are too obvious.

Fair enough, just to get your point of view, from the way you view it, you would not consider Magnus playing Qxh6 against Karjakin in the WC tiebreaks a brilliant move then correct, if you don't see that like that, then we can just agree to disagree on the subject

"you would not consider Magnus playing Qxh6 against Karjakin in the WC tiebreaks a brilliant move "

• Indeed, checks and captures are too obvious.

@tpr said ^

"you would not consider Magnus playing Qxh6 against Karjakin in the WC tiebreaks a brilliant move "

• Indeed, checks and captures are too obvious.

So that still applies to moves that seem less intuitive such as Qxh6 at first glance, that's an interesting perspective

There are many incredibly brilliant moves that aren't captures and checks of course, probably the most famous of which being Marshall's Qg3, which may be the best move of all time, that's a whole different debate