toss-up

US /ˈtɑːs ʌp/
UK /ˈtɑːs ʌp/
"toss-up" picture
1.

niewiadoma, pięćdziesiąt na pięćdziesiąt, remis

a situation in which either of two choices or results is equally possible and it is impossible to predict which will happen

:
It's a toss-up whether she'll get the job or not.
To niewiadoma, czy dostanie tę pracę, czy nie.
The election is a real toss-up between the two main candidates.
Wybory to prawdziwa niewiadoma między dwoma głównymi kandydatami.