Árpád Élő (1903-1992) is the creator of the ELO rating system. 1903 has the latest occurring solstices and equinoxes for 400 years, because the Gregorian calendar hasnt had a leap year for seven years or a century leap year since 1600. ... 1992 is a leap year starting on Wednesday of the Gregorian calendar. ... The ELO rating system is a method for calculating the relative skill levels of players in two-player games such as chess and Go. ...