You have to claim the draw by clicking the draw button. It is not automatic.
Threefold repetition rule

Oh, thanks! I actually lost a game before, because I flagged and I didn't know why the repetition rule did not work. Thanks!

You have to claim the draw by clicking the draw button. It is not automatic.
Two question to confirm: 1) so, on Chess.com, I have to click on "draw" before I make that third repetition? 2) on chess.com, the draw isn't automatic even on the 5th repetition?

Two question to confirm: 1) so, on Chess.com, I have to click on "draw" before I make that third repetition? 2) on chess.com, the draw isn't automatic even on the 5th repetition?
Not anymore. Triple repetition of position is an automatic draw, as is 50 moves without capture or pawn move.

martin, but in my game today, I repeated a position/move 5 times and saw no automatic draw???
Link to the game?
The rule is that the exact same position has to repeat 3 times, on each repetition the same side has to be on the move, and if castling was possible in at least one of the positions, it has to be available in all. Also, if en passant was available in the first position, that doesn't count toward repetition.

If you meant this game, there was no repetition. Moving your king back and forth isn't repetition since your opponent was not repeating the position.
https://www.chess.com/live/game/4330736253
Nevertheless, there is no particular reason to automatically draw a game on the "3rd" (actually 2th) repetition. Since the FIDE rules changed in 2017 into their current form, an automatic draw on the 5th (actually 4th) repetition is as easy for an engine to verify as the older repetition rules. Then, why not follow it?

Nevertheless, there is no particular reason to automatically draw a game on the "3rd" (actually 2th) repetition. Since the FIDE rules changed in 2017 into their current form, an automatic draw on the 5th (actually 4th) repetition is as easy for an engine to verify as the older repetition rules. Then, why not follow it?
The site used to have that, but changed it. Probably due to the number of tickets a forums asking why the game wasn't automatically drawn after the triple repetition.
Also it was kind of hard in a Live game to click the draw quickly enough after your move, before your opponent moved, and the site maybe didn't want to recode things so that a draw out in before the move would be checked for repetition after, even if if the opponent declined.
This is a game where I am white and my opponent decides to repeat the position (although he is winning). However, I feel like the same position repeated 5 times before the draw was announced. This has happened to me a couple of times already, so I think there is something about the rule that I don't understand. Can please someone help me understand this?
After white's move 23, the same position occurs after move 25, 27, 29 and 31, when draw is finally shown.