What is the highest number of moves played in a game on lichess?

@petri999 said in #10:

under the fide rules they are not instant both need to be claimed. 75moves and 5th repetition are instant draws

I'm aware. It wouldn't be possible to play a max move game in front of a FIDE arbiter though. The same page that said 5898.5 for 50 moves said it's 8000 odd moves for 75.

Lichss implementation obviously can be anything. I don't thing 75/5th repetition is implemented. But at least third repetition in not instant unless you have set in on your settings. I do have it if less than some amount of time remains.

on lichess it's a 50 move rule is an instant draw, I believe, I didn't see it in the faq but there are youtube videos of games that ended because of the lichess 50 move rule.

there was an interesting video of an online tournament where one player was slightly down and was playing for a draw, the other player slightly up and didn't want a draw, but her pawns were kind of locked because if she moved one she would lose a pawn. So they shuffled pieces around for 49 moves without capture until the player slightly up moved a pawn, surprising the commentators until they quickly worked out she had to move a pawn or the game would end in a draw. I thought it was amazing the player knew she was on move 49 without a capture or pawn move.

@petri999 said in #10:

Lichss implementation obviously can be anything. I don't thing 75/5th repetition is implemented.

Fivefold repetition is implemented. In fact, I first learned of its existence through Lichess.

Apparently the limit is 300.

Probably because of things like this

You can see that at the ending white was just moving the king around the board instead of finishing the game.

As others have said above, Lichess caps games at 300 moves, which is totally arbitrary of course, but understandable to protect server capacity.

Ignoring that arbitrary cap, current wisdom says that under FIDE rules, the longest possible game is exactly 8848.5 moves.
This applies the rule that the game is a forced draw after 75 moves without pawn move or capture. (FIDE laws of chess, article 9.6.2 ).

In a longest possible game, the counter for the 75 move rule has to be restarted by a pawn move 88 times, plus 30 captures. Quote from a youtube commentary: "There are 30 captures possible, and 96 pawn moves, but 8 pawn moves must be officer captures, so that the pawns can pass one another. There is some extra subtlety required to squeeze out every last half move. There are really 4 'innings'. Half a move is lost every time we change who does the next capture or pawn move. The minimum number of changes possible is 3. So the total number of moves is 75*(30+96-8)-1.5 = 8848.5"