Playing field

имя существительное [спорт] поле, площадка для игр Например: level playing field — единые правила игры, равные возможности (для соперников, конкурентов)

Большой англо-русский словарь

Playing field

noun 1. a field for various games; especially the part of a field officially marked off for play 2. a set of conditions for competition (as in business) — usually used in such phrases as a level playing field

Merriam-Webster's Collegiate Dictionary