Facet of the Achievement component:
Gamers who score high on Mechanics derive satisfaction from analyzing and understanding the underlying numerical mechanics of the system. For example, they may be interested in calculating the precise damage difference between dual-wielding one-handed swords vs. using a two-handed sword, or figuring out the resolution order of dodges, misses, and evasions. Their goal in understanding the underlying system is typically to facilitate templating or optimizing a character that excels in a particular domain.
(Source: Nick Yee, Motivations of Play in MMORPGs)