my text defines player set as:
In N-player game $g$, each non-terminating node is partitioned into $N+1$ sets $g^0, ... g^N$. These are player sets.
However it makes no attempt to identify them on a figure.
Each nonterminating node is partitioned into 2 sets, so N = 2 - 1 = 1. So our two player sets are $g^0, g^1$. Can someone please identify $g^0$ and $g^1$ on the game tree?