However, if O plays a corner as its second move, a perfect X player will mark the remaining corner, blocking O's 3-in-a-row and making their own fork.
Then this game will be a draw, X cannot win.
The third X does NOT threaten a win.
In popular culture edit Wordsworth alludes to tic-tac-toe in his The Prelude (1799).
Encyclopedia of Video Games: The Culture, Technology, and Art of Gaming.