A controversy involving Tringov took place at the 20th Chess Olympiad in 1972. In the fourth round of Final Group A, the Bulgarian and Soviet Union teams met. A game between Tringov and Viktor Korchnoi was adjourned after 41 moves with Tringov to seal his next move. At this Olympiad, sealed moves were written on a separate piece of paper, not the player's score sheet. Tringov rejected this way of sealing his move and instead wrote it on his score sheet.