Why five moves? If it were three moves that would be the shortest legal draw, right?
Worlds shortest legal draw !

No, the same position has to occur 3 times.
And, what about a draw by agreement on the first move?
[EDIT] Duh, never mind.

No, only after 5. ... Nf6 the position has been repeated for the third time so a draw can be claimed. That would be the earliest you could claim a draw by threefold repetition.

I think the OP is referring to draws per the rules not per agreement. The difference being that it only takes one player to claim a draw per 3-fold repetition, 50 move rule, stalemate and so on while in the other case both players have to agree.

I think the OP is referring to draws per the rules not per agreement. The difference being that it only takes one player to claim a draw per 3-fold repetition, 50 move rule, stalemate and so on while in the other case both players have to agree.
bingo

I always assume I miss something thus the "so on" refers to all the cases I could have forgotten ..
Actually, one comes to mind right now: Insufficient material. I knew there was something I left out ...

While you are correct in terms of when a game actually starts, it is irrelevant in terms of the 3-fold position rule. The starting position still won't count for that purpose even though the arbiter hit the clock.
That's nothing. I once agreed to a draw twenty years before the game started.
lol lol lol

No, the same position has to occur 3 times.
And, what about a draw by agreement on the first move?
I'm team-captain of the 4th team of my chess-club. On the last play-day, when 3 out of 4 games went underway my board #1 guy went to drink a coffee with his opponent.
It took them quite long and I was wondering when they were going to start. After some 20ish minutes they came back and said: "We're done. It's a draw."
Found that to be extremely lame. Why get up early on a sunday morning, drive to another city to then declare draw on move 0? -_-
A game I played when I first started out