In both of the rounds 664 and 663, I have placed in the same rank 783. The fact is one of them was Div1 and another one was Div2. Strangely enough, I got almost the same delta change from almost the same initial rating! So this made me think of placing behind 782 reds/orange/purple is the same as placing behind 782 cyan/blue/purple. ↵
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**UPD:** [user:Um_nik,2020-08-31] gave a really nice explanation for this case (Also thanks to [user:Radewoosh,2020-08-31], though I couldn't understand the fact fully from him) . Here is his quote: "Your expected place is not the number of participants with higher rating + 1. The probability of you placing higher than someone calculated as $\frac{1}{1-c^{r2-r1}}$ where $r1$ is your rating, $r2$ is their rating and $c$ is some constant. Now we sum this (1 — this, actually) over all participants and get the expected number of people who will place higher than you."
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**UPD:** [user:Um_nik,2020-08-31] gave a really nice explanation for this case (Also thanks to [user:Radewoosh,2020-08-31], though I couldn't understand the fact fully from him) . Here is his quote: "Your expected place is not the number of participants with higher rating + 1. The probability of you placing higher than someone calculated as $\frac{1}{1-c^{r2-r1}}$ where $r1$ is your rating, $r2$ is their rating and $c$ is some constant. Now we sum this (1 — this, actually) over all participants and get the expected number of people who will place higher than you."
