[7] Aesthetics in chess can be both a source of pleasure for humans and also instruction, as compositions or games featuring it typically illustrate original ideas or new instantiations of old ones.
Factors about a game or move sequence (also referred to as a combination) that might cause it to be regarded as 'brilliant' by most players include, among other things: expediency, disguise, sacrifice, correctness, preparation, paradox, unity and originality.
Composition conventions such as not having any checks or captures in the first (i.e. key) move, and the use of variations to illustrate a particular theme (e.g. zugzwang, pin), also play a role in the aesthetics of the game.
These are beauty characteristics that apply approximately equally to both domains; examples include heuristic violations, economy and material sacrifice.
[9] Some factors that pertain solely to real games (e.g. pressure under time control) or compositions (e.g. avoidance of castling moves) may be conflated with aesthetics in the game—and perhaps to some degree this is justifiable;[10] however, they would lie outside the common ground described above.