user11144: Do you know a chess tournament (I wrote Round Robin, since it seems extremely improbable for Swiss) where all games ended drawn? Since of course even I can come up from personal experience with a four player tournament where this happened, let's assume at least 8 players. Calculating with a fairly valid drawing probability of 1/2, I get 1/2^(8*7/2)~10^-9, so this would be a very rare event.

user26472: According to the Wikipedia page of chess world records, the record for draw percentage is 93.3 (that tournament had ten players), meaning no: there hasn't been a recorded tournament with 100% draws.

11144: <p>Do you know a chess tournament (I wrote Round Robin, since it seems extremely improbable for Swiss) where all games ended drawn? Since of course even I can come up from personal experience with a four player tournament where this happened, let's assume at least 8 players. Calculating with a fairly valid drawing probability of 1/2, I get 1/2^(8*7/2)~10^-9, so this would be a very rare event.</p>
 26472: <p>According to the <a href="https://en.wikipedia.org/wiki/List_of_world_records_in_chess#Highest_percentage_of_draws_in_a_tournament" rel="noreferrer">Wikipedia page of chess world records</a>, the record for draw percentage is 93.3 (that tournament had ten players), meaning no: there hasn't been a recorded tournament with 100% draws.</p>
