Ranking System
To make the points system work from the beginning, the players were initially partitioned into three groups according to ability. The upper band containing 300 point players, then 200 point players, then 100 point players.
The ranking system mirrors the English Table Tennis Association (ETTA) points system (although is completely independent), and is based around expected wins and unexpected wins. An unexpected win between players A and B occurs when A beats B and A has fewer points than B. The gain function is let x = loser's points - winner's points in arctan(x / 30) * 55 / PI + 27.5 The loss function is let x = loser's points - winner's points in if(x<0) then 0 else if (x<=64) then 4 sqrt(x) else 32.
In the expected win case, we do not punish the loser since they were after all, expected to lose!
An inactivity penalty of 20 points is given to players that do not record or play matches for two squad sessions in a row
The results will be entered chronologically, with penalties entered last.