Rating systemTournament ratingTo calculate the player rating in a backgammon tournament, we use the following formula: R = 10 * log_{2}(N) / M , where N – number of players in participating tournament, M – player’s place. The rating obtained in the tournament will be added to the existing tournament. Every month, the backgammon tournament rating is reduced by two. (R = R / 2) Participate in backgammon tournaments more often to keep your rating high Backgammon Game RatingTotal and daily ratings are calculated as follows: ratings are considered as follows oW in the event of a victory in a backgammon match, the player rating increases by the number of chips won. If a player loses a game of backgammon, then his rating is reduced by 80% of the number of chips lost. Daily rating is reduced by 5%. Therefore, play backgammon more often so as not to lose your place in the ranking. Elo ratingThe developed Elo system was an American professor of physics at Markett University and a Hungarianborn chess player Arpad Elo ( Élő Árpád ) This system takes into account the strength of the players. If a strong player plays with a weak one, then in case of victory his rating will increase slightly. But in case of defeat, it will fall noticeably. And vice versa, a weak player will win a noticeably higher rating, and if he loses, he will not lose much. Initially, each new backgammon player receives a rating of 1500. The change in Elo rating is calculated by the formula: E = ± R * 10 * Sqrt( L ) / ( 1 + 10 ^{D * Sqrt( L ) / 400} ) , where L – match to how many victory points (in moneygames the value is 1); D – the difference in the Elo rating between the player for whom the rating is calculated and his opponent before the game; the ± sign is interpreted as follows: if won, the current rating increases, if lose, then subtracted; R – the coefficient taking into account how quickly the rating for new players will grow is determined by the formula: If G is the total number of games for all time, then 
