>>53 どうやら1/1000秒で決定するようです。 2. In determining whether there has been a tie between athletes in different heats for a ranking position according to Rule 166.3(a) or for the last qualifying position for a subsequent round based on time, the Chief Photo Finish Judge shall consider the actual times recorded by the athletes to 0.001 second. If it is thus (or according to 167.1) determined that there has been a tie for a ranking position the tie shall be broken by draw. Where there is a tie for the last qualifying position for a subsequent round based on time or place, the tying athletes shall be placed in the next round or, if that is not practicable, lots shall be drawn to determine who shall be placed in the next round. http://www.iaaf.org/mm/document/06/28/89/62889_PDF_English.pdf