Once again, a humorously confusing result.

[Marlene H.]

I just completed a game with a bot.  It ended in a draw.
I began the game with a 1517 rating vs his 1521.
Because his rating was slightly higher than mine, I received a +0.1 reward for my effort.

However, my new "upgraded" rating is now listed as 1516!

I do realize that my initial rating must have been rounded up from 1516.xx.  But for it to round up to 1517, it had to have been at least 1516.5.
So how in the world would the new (at minimum) 1516.6 round down to 1516?

Obviously this is a pretty insignificant matter, and I have no major or minor concerns about it.  But I do have an abiding curiosity as to how in the world this could happen.
If you have a bit of free time on your hands, or are bored and looking for a puzzle, it would give me great pleasure to understand the obscure and obviously magical formula that could lead to these results.

Thank you for your time and attention. 

[Jimmy V.]

We are probably not consistent with the rounding. Somewhere we round down, somewhere we round to the closest integer.

Sorry about the minor issues that it sometimes causes. We never took the time to look at that closely.