Editing Elo rating system (section)

====Combating deflation====
Because of the significant difference in timing of when inflation and deflation occur, and in order to combat deflation, most implementations of Elo ratings have a mechanism for injecting points into the system in order to maintain relative ratings over time. FIDE has two inflationary mechanisms. First, performances below a "ratings floor" are not tracked, so a player with true skill below the floor can only be unrated or overrated, never correctly rated. Second, established and higher-rated players have a lower K-factor. New players have a {{math|1=''K'' = 40}}, which drops to {{math|1=''K'' = 20}} after 30 played games, and to {{math|1=''K'' = 10}} when the player reaches 2400.<ref name="FideRules"/>
The current system in the United States includes a bonus point scheme which feeds rating points into the system in order to track improving players, and different K-values for different players.<ref name="glickman"/> Some methods, used in Norway for example, differentiate between juniors and seniors, and use a larger K-factor for the young players, even boosting the rating progress by 100% for when they score well above their predicted performance.<ref>{{cite web |url=http://www.sjakk.no/nsf/elosystem_index.html |title=Elo-systemet |website=Norges Sjakkforbund |access-date=2009-08-23 |url-status=dead |archive-url=https://web.archive.org/web/20131205025157/http://www.sjakk.no/nsf/elosystem_index.html |archive-date=December 5, 2013 }}</ref>

Rating floors in the United States work by guaranteeing that a player will never drop below a certain limit. This also combats deflation, but the chairman of the USCF Ratings Committee has been critical of this method because it does not feed the extra points to the improving players. A possible motive for these rating floors is to combat sandbagging, i.e., deliberate lowering of ratings to be eligible for lower rating class sections and prizes.<ref name="glickman"/>