I’ve been thinking. What are some good recommendations for rank restrictions. Generally you want balanced diet of strong and weak opponents, especially since Glicko the god of ranks seems sensitive to winning/losing streaks.
Fundamentally the problem is that there’re too few very strong and very weak players. Also, maybe when people accept games they rather prefer a slightly stronger player than slightly weaker one. So even reasonable rank restrictions can lead to unbalanced opponent selection.
For example, as a 3k my settings are min 5k and stronger, and still 2/3 of my games are against weaker opponents.