How do you cope with losing in a game?

it depends on who you lose to))
if it's a strong player, there's nothing offensive about it, but if the chances were equal (or almost) and you were just unlucky, then it's a little annoying) although there's nothing terrible about it either, you just weren't lucky this time, you'll be lucky next time))
as for computers... usually in campaigns) then you play again, which you don't really want to do)).