Rating floor

A rating floor is a lower limit applied to a rating, meaning a number that a system uses to estimate a player's competitive strength. Its exact meaning depends on the organization. In US Chess, for example, a player can have a personal floor: later poor results cannot push the official rating below that value. The system derives floors from a player's peak established rating and also has special rules for matters such as certain prizes and the Original Life Master title.

FIDE, the International Chess Federation, works differently. On its current standard rating list, 1400 is the publication threshold: a new rating must be at least 1400, and a listed player who drops below 1400 is shown as unrated on the next list. This is an operational lower boundary, not a permanent personal floor of the US Chess type.

FIDE title regulations also use the phrase adjusted rating floor when calculating title norms. There it does not restrict the player's own rating. Under precise conditions, it lets one very low-rated opponent be treated as having a specified minimum rating for the norm calculation. The phrase therefore has to be read in the context of the particular rules.