The revised system was now based on only the two previous seasons, and updated annually after the World Championship. While the ranking point allocations have undergone modifications down the years the basic system remained the same up until the 2009–10 season. For the 2010–11 season, the system was revised to incorporate ranking updates after every tournament—instead of once a season—in an effort to make the rankings more reflective of current form. The current system utilises a two-year "rolling" format where points from tournaments in the current season replace the points from corresponding tournaments of two seasons ago. The seedings for tournaments change from tournament to tournament: the defending champion is allocated the top seed followed by the reigning world champion and the remaining seeds are taken from a "seeding list". When the official rankings were only calculated once a year the seedings for tournaments—with the exception of the top two seeds—followed the official rankings. Players and pundits closely tracked the ranking points earned during a season; the "provisional rankings" (which had no official status in the game) were the rankings based on the ranking points accumulated in the previous season, combined with those accumulated thus far in the current season, and as the season progressed they converged on the official rankings for the following season. The provisional rankings gave an indication of a player's form, and as the season approached its dénouement, the provisional rankings would become a source of tension as the battle for the number one spot, top 16 places, and tour qualification intensified. The introduction of the rolling rankings in 2010 facilitated updates to the seeding list throughout the season. Various "cut-off" points are selected at convenient stages during the season where the rankings are "frozen" and used as seedings for the next few tournaments, until the next revision. The original "Order of Merit", created for the 1975–76 season and based on just World Championship results, awarded the winner five points, the runner-up four, semi-finalists three, and so on down to one point for players who lost in the last 16. The world rankings, introduced in the following year, used the same allocation. Subsequent tournaments that were assigned ranking status worked on the same system but with the World Championship from 1983 onwards carrying double points. The ranking point allocation was later revised slightly with winners of all bar the World Championship now receiving six points, runners-up five, down to one point for the last 32; the World Championship more or less stayed as it was with ten points for the winner, incrementally reduced by two points for each preceding round, but now awarded one point for the last 32 in line with the other tournaments.