[altvali]

You don't need to care about possible games, but game states, what's the best result and the move to achieve it in each. Another user computed an upper bound at 8.7E+45 positions: https://github.com/lechmazur/ChessCounter . I pointed out that our planet has about 1E+50 atoms. And we can further compress the database by perhaps two orders of magnitude if we don't store symmetric positions or positions close to mate. A Kardashev 2 civilization could play perfect chess.

[goatlover]

> A Kardashev 2 civilization could play perfect chess.

Assuming they would want to waste part of a planet's worth of computing resources to play perfect chess. In any case, it's far beyond anything we can compute.