Advanced rating range.

Why rating range's step is 50 elo points?

I would like to play with players +/- 100 around my rating, but I can't do that now.

Notorious inferior chess.com have that feature.

You can - it is in steps of 50 but you can set the range (50 above, 100 above, 150 etc)

I mean use range as 1514-1714 (1614 +- 100).

Just lose a couple of games then set the range :)