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…is the player’s rating plus twice the RD” [ 3 ] . Line up the two constructions and the correspondence is not loose: $X$. ​ Rating deviation $\mathrm{RD}$ , bounded to Showdown’s 25–130 range 95% interval: X $\pm$ 1.96 $\cdot$ $\mathrm{SEM}$ 95% interval: R $\pm$ 2 $\cdot$ $\mathrm{RD}$ [ 3 ] Reliability rises with more independent items RD falls with more games played in a period [ 2 ] Reliability falls with time since calibration RD rises with time since the player’s last game [ 3 ] This is the article’s…

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