The squash ladder seeds the players in reverse order.
The challenge is for the bottom player (number 1 seed) to work his way through the ladder to reach the top of the ladder by the end of the year.
The basic rules are:
You can challenge up to 3 places above your position.
The challenger has 7 days to accept the challenge and play the match.
It is first to 3 games. American scoring. First to 11 / 15 which ever you agree at the start of the match.