D.5 - DCI Rating System


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D.5.1- The DCI has a rating system. Each registered DCI member's wins and losses in sanctioned tournaments are reported to the DCI and are used to calculate the player's rating.

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D.5.2- The DCI tracks ratings in four categories. They are: Vintage = Type 1 (see Rule D.13) and Type 1.5 (see Rule D.14) formats. Extended = Extended (see Rule D.15) and Extended Block Constructed (see Rule D.18) formats. Limited = Sealed Deck (see Rule D.17) and Booster Draft (see Rule D.19) formats. Standard = Standard (see Rule D.16) and Standard Block Constructed (see Rule D.18) formats. [Tournament Rules 1997/10/01]

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D.5.3- All players start with a rating of 1600.

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D.5.4- People who have played less than 25 matches (best 2 of 3) are considered to have a 'provisional rating'. After that, scores should be accurate to within plus or minus 56 points.

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D.5.5- During 'provisional rating' period, a person's rating is: (Rc) + ((400 * (wins - losses)) / number of matches) Rc = Average rating of all opponents (at the time the match against that opponent was played). This rating is re-calculated after each match.

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D.5.6- Once a player is off of provisional rating, their score changes with each match: New Score = (Old Score) + (K * (W - We)) K = 32 for ratings of 0-2099, 24 for 2100-2399, 16 for 2400 and up. W = 1 for a win, 0 for a loss. We = 1 / ((10^D)+1). D = (difference between your and opponent's ratings) / 400. D is always a positive number.

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D.5.7- Scores only count in officially sanctioned tournaments and if the tournament coordinator actually sends the results to WotC.

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D.5.8- Tournaments with less than 8 people do not count in the ratings system. Ones with 8 to 31 people use a K value of 1/2 the above (most often 16). [Tournament Update 1997/08/01]

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D.5.9- For sanctioned tournaments without a Level II certified judge, the K value will be 1/2 (most often 16). This is cumulative with other decreases in the K value. [Tournament Update 1997/08/01]

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