Method of calculation The calculation is inspired by the ELO rating that is used in chess. ELO however is not exclusively for chess!  The Elo rating system is a method that estimates the relative strength of a player in a game.  In this system, beating a higher-rated opponent gives you more points than beating one with a lower rating. At the same time, your opponent loses as many points as you win.
For all details go visit the Omnicalculator.

Remarks:

• Each new sailor starts with a rating of 1057. This is the current (2025) median value of ELO ratings; -1 compared to 2024. The median is corrected on January 1st;
• I am using one 'development coefficient' (k-factor): 5. This results in relative small changes per event;
• After each event a comparison is made between each sailor (for a regatta with 10 entries: 45);
• For regattas that use a handicap system (like PY) that comparison is done per rig (for a regatta with tree 5's, two 6's, four 7's and one 9: 10 comparisons.);
• Rig 'agnostic' regattas are not use for the calculation (for obvious reason);
• Mixed fleet (different boattypes in 1 class) regattas are not used for the calculation;
• The results are processed sequentionally in date order. If late results arrive this could impact the ratings points of already processed events; meaning: the ratings are changing almost weekly;
• Initially the start rating is hidden. After 100 comparisions the rating is visible;
• The minimum gain per comparison is .6 (In effect this means that very good sailors do not earn points when winning from sailors with a much lower ranking.
• Sailors without a result in the past 2 years wil become 'inactive' (= invisible in the ranking list),  they will not loose their ranking points;