From D&D 5e and "Theatre of the Mind" in combat, mxyzplk had the second highest answer about running combat in theatre of the mind. He mentioned:
Same thing with movement. I have all my players convert their movement into an actual "Move bonus", +2 per 5' of movement, so a 30' move is a +12, for example. (Side rant, the conception of movement as fixed when everything else in the system is a variable is one of the greatest missed opportunities in D&D design and all the other games that blindly inherit their metaphor from it.) "I want to get around that orc and flank him with Billy!" "OK, roll Move. You're not even inside the door yet and there's a bunch of other orcs, so I'll call that DC 20, fail means you get to melee but not in flank, fail by 5 means someone AoOs you on the way."
This got me thinking of how to implement this. I was unable to find any other posts or details that further explained this idea.
I'm imagining that the DM will set a DC that would have to be overcome to successfully move. Rough distance and/or enemies would cause an increase in that DC, things like disengage or dash would cause a decrease in that DC. However I don't have enough details to flesh out a homebrew rule that would be balanced and not cause more headache than it's worth.
Are there any existing systems similar to this that I may have missed or are there any good examples that can be provided to serve as a base for fleshing this out?