* Sorts the players and stores their place in the given field, starting with
* 1. Non-players get 0 written into that field.
* Returns the beginning of a sorted chain of the non-spectators.
* Sorts the players and stores their place in the given field, starting with
* 1. Non-players get 0 written into that field.
* Returns the beginning of a sorted chain of the non-spectators.