Shouldn't the utility function of two-player zero-sum games be in the range $[-1, 1]$? In Appendix B of MuZero, they say


  In two-player zero-sum games the value functions are assumed to be bounded within the $[0, 1]$ interval.


I'm confused about the boundary: Shouldn't the value/utility function be in the range of [-1,1] for two-player zero-sum games?
it can be either. If you consider the lack of reward as "penalty" then getting 0 reward is bad.

if you use a value estimator through a neural network, the range of rewards will dictate the squashing function you use for the output layer