>>>So every game is capitalized, as in Poker, Rugby, Checkers?
>
>Why is "The Library of Congress" capitalized? Does this mean all libraries are capitalized? ;-)

Let's take a step back. I'm the one with questions, and you are the helpful native with answers and explanations.

So far, my conclusions, probably wrong, are

1) there are no rules in english grammar, it has only lists

2) to capitalization of ordinary Nouns there are no lists, either; it's a completely arbitrary Decision by one who writes.