“gg” is sportsmanship in chess

Indeed, "gg" is often considered an expression of sportsmanship in the world of chess. It is a way for players to acknowledge and appreciate their opponent's efforts and skills, regardless of the outcome of the game. By saying "gg" after a match, players demonstrate respect, fairness, and a positive attitude, emphasizing the spirit of friendly competition and camaraderie that chess fosters.

You can interpret any thing any way you want to.

And your source is what? "Is often considered" by whom, where and since when?

In real chess games there is a handshake before and after the game. But no one ever says "gg" ever.

Indeed. In real chess games, handshakes are common before and after the game. As for saying "gg", it's not typically part of the chess tradition. It's more of a thing in online chess.

I've never seen someone saying "gg" here. Is that more common at higher ratings or longer chess?

Good Game sounds as ironic or sarcastic many time. Handshake is the standard gesture, word and attitude.

It's unfortunately rare but I encourage you to start! I say it during every game.

You can have someone give a terrible handshake too (limp, no eye contact, body posture, squeeze too hard or twist the wrist, etc). "gg" is the best replacement for it. 
Now, especially in the context of the internet chat, "gg" has only the context the perceiver gives it. So, as a community, if we decide it's respect, then it doesn't actually matter what the actual intention was of the person who wrote it, all that is perceived by the receiver is "gg" and their connotations to it.

Then why not play a computer if there is no human interaction???
I've had lot's of great conversations on this platform. Just have to not be scared, give respect, give people the benefit of the doubt, recognize they're perspective, and don't be bothered by the few bad apples (I usually pity them and wish them joy and happiness to offset their sad lives that would lead them to be disrespectful to strangers and someone joining them for a chess match).

Ohhh, that's hilarious! You sir, have a fantastic sense of humor. well played, gg (:

gg

I have seen many many esports tournaments (chess and Hearthstone and others) and no player ever chats with the opponent. Let alone say "gg" or anything.

My experience on OTB tournaments, it seems to be expected, to look your opponent in the eye and shake hands, saying good luck before the game and good game afterwards.

Handshake yes, absolutely. "Good luck" and Good game" are entirely optional and very rare.

I frequently say "gg" at the end of a game. It means "good game." Also, that's what it means. And besides, that's what it means. Moreover, what it means is "good game." So, if you want to interpret it to mean something else, that's in your head and is your problem.

Starcraft & Supersmash are the two I know. Even Chess streamers say it, such as Anna Cramling.

in OTB games shaking hands after the game is widely considered to be the polite and expected action. saying "gg" isn't really expected but it is polite.