<P> 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 . </P> <P> Since 2005--06, human - computer chess matches have demonstrated that chess computers are capable of defeating even the strongest human players (Deep Blue versus Garry Kasparov). However, ratings of computers are difficult to quantify . There have been too few games under tournament conditions to give computers or software engines an accurate rating . Also, for chess engines, the rating is somewhat dependent on the machine that the program runs on . </P> <P> For some ratings estimates, see Chess engine § Ratings . </P> <P> The Elo rating system is used in the chess portion of chess boxing . In order to be eligible for professional chess boxing, one must have an Elo rating of at least 1600, as well as competing in 50 or more matches of amateur martial arts . </P>

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