
Back to forum Thibault de Vassal (20100405) Advanced chess ratings calculation For some reasons that I'll explain below, I updated the advanced chess (bullet, lightning, blitz, freestyle) rating calculation rules to the following : "Performance = Opponent Current Rating if the game is drawn, + 350 if the game is won, 350 if the game is lost. The following bonus / malus applied to White and to Black makes ratings fair, as it is not possible to force a player to take White or Black before a game : (White) Performance = Performance  50 (Black) Performance = Performance + 50 If there's a winner and if his rating is below 2400, his new rating his : New Rating = ((8 x Current Rating) + (2 x Performance)) / 10 Otherwise : New Rating = ((9 x Current Rating) + (1 x Performance)) / 10 The rating calculation does not take account of wins obtained by a stronger player when the Elo difference is greater than 350 points, the same with losses by a weaker player. In case of a draw or loss against a player rated more than 200 points less, the opponent's rating considered in calculation is : Current Rating  200. A player who wins a game cannot lose Elo points, a player who loses a game cannot win Elo points." More details : http://www.ficgs.com/membership.html#rating_advanced_chess The rule that just changed is "If there's a winner and if his rating is below 2400, his new rating his : New Rating = ((8 x Current Rating) + (2 x Performance)) / 10". This rule will probably be updated again in a few months with a rating limit of 2200 instead of 2400, when advanced chess ratings will be more coherent with correspondence chess ratings. The reasons are : 1) Advanced/freestyle chess is often neglected partly because players will likely lose some rating points (many strong players using Rybka 3like engines still have a rating of 1800 or 2000, there are several reasons to this), the main point is probably the interface but I'm fixing it (e.g. the new touchmove option  see Preferences). 2) Chess engines are just stronger and stronger while the ratings do not increase with the previous rules, as a consequence players who just tried advanced chess once years ago shouldn't still top the rating list. It is of course a way for players to find their place quicker in the rating list & to incitate players to play more games as well. Thibault de Vassal (20100419 16:41:06) Advanced chess ratings calculation As advanced chess (not correspondence chess) ratings move too fast, I just updated the calculation rules : If there's a winner and if his rating is below 2400, his new rating his : New Rating = ((18 x Current Rating) + (2 x Performance)) / 20 Otherwise : New Rating = ((19 x Current Rating) + (1 x Performance)) / 20
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