Lightface analytic game

Short description: Game whose payoff set A is a subset of Baire space

In descriptive set theory, a lightface analytic game is a game whose payoff set A is a ${\mathrm{\Sigma }}_1^1$ subset of Baire space; that is, there is a tree T on $\omega \times \omega$ which is a computable subset of $(\omega \times \omega {)}^{<\omega }$, such that A is the projection of the set of all branches of T.

The determinacy of all lightface analytic games is equivalent to the existence of 0^#.