However the ultimate optimal game of chess is still not known/solved though (in the end it's either a win for white, for black or a draw) and brute-force is ali

However the ultimate optimal game of chess is still not known/solved though (in the end it's either a win for white, for black or a draw) and brute-force is alive and well: every possible position with seven pieces on board has been solved by brute-force and the endgame is now only one lookup in a lookup table when there are only seven pieces left on board. I think they're currently solving it for eight pieces. So it's learning but then brute-force for the end game.