A game can reveal who mistakes temporary advantage for personal superiority.

Luck arrives, and then people interpret it. Someone ahead in a game because the dice fell well may start talking as though the position reflects something true about them, and the shift is visible to everyone else at the table. It is a small thing, and it previews how they will handle a good year. Circumstances change. The interpretation people put on them tends not to.

Watch how people behave when they are winning at something trivial, since it is cheap information. Check your own commentary when things go your way, and describe the luck as luck.