Game-Table is not yet finished. It's a hell of calculating ranking position in real-time for the database ... I am still thinking of the best solution.
... just be patient
Ranking on gametable
I'd suggest to make a stats cache (table with record per player) and update it after each game is finished (ranking games). Player record may contain other stats as well.
When player is not found in the table, return table size +1.
First and foremost I'm a sailor
Nah - the amount of data can be handled in real-time.