Just for clarification for the OP's question regarding
"What casino games are sports in your country?" , does it mean those games/sports that were being played exactly in the casino but began to consider it as sports and already included in sports events?
I'm not aware that billiards before are mostly played in a casino hall. Even if does, I think that was already a usual sport before. Our country is known for having good billiards players since the classic year that's why I was surprised that billiards is actually a casino game, maybe in some countries.
You just give me a trivia there, OP.
...! without depth is a simple and open question, on the other hand billiards is a game where you bet, a casino organizes an event or simply players put money on the table, what do you call the spaces that have billiard tables?
Billard Casino, Bergisch Gladbach, Germany.
Address: Overather Str. 56, 51429 Bergisch Gladbach, Germany
If you don't know casinos that have pool tables, give it a GS.
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Poker won't be considered as a sport by a reputable organization. To determine whether or not a game can be competitive is easy.
If I play 100 chess matches with a grand master, it would be guaranteed 100 loss.
If I play 100 pool matches with a pro pool player, it would be guaranteed 100 loss.
If I play 100 poker rounds with a pro poker player, the result will be unknown... it depends on how many I draw great cards.
I think that is the point of the question, not everyone can play with a chess master, they need to be ranked, that is why there are federations that give you a ranking and that would allow you to access events according to your level, that simple organization and order is the beginning of at least playing for the simple fact of being number one.
Competing to win is what leads to the beginning of many activities that require preparation of the mind, body and then a federation or organization supervises you.
I am neither against nor in favor of calling anything that is organized and that has certain parameters to define it as a sport, but doing it for the simple fact of competing and showing that you are the best, then makes you be in a healthy activity and if that makes it possible to organize federations and world championships, that's fine.