playing field

noun

an expanse of level ground, as in a park or stadium, where athletic events are held.

Origin

1575-85

Examples from the web for playing field

So the public's on a level playing field with everyone else.
Take turns placing your magnets onto the playing field.
Dozens of spectators in crisp khakis or seersucker suits tramp the playing field in rubber-and-leather duck boots.
Supporters usually take a rooster with them and release the bird onto the playing field.
Cull the harp seal population, say fishermen, and you level the playing field.
Great athletes are often said to experience time on the playing field in a kind of slow motion.
Right now, both parties pretty much know the playing field.
That's no way to level the playing field, no matter how you look at it.
All these people have a sort of parlay mentality and they need to get on the playing field before they can start running it up.
No argument here, except that you still seem to think world energy markets are fair and the playing field is level.

British Dictionary definitions for playing field

noun

(mainly Brit) a field or open space used for sport