In fact, there are already solved positions that are known to require over 500 moves to mate: https://en.wikipedia.org/wiki/Endgame_tablebase#Tables https://en

In fact, there are already solved positions that are known to require over 500 moves to mate: https://en.wikipedia.org/wiki/Endgame_tablebase#Tables https://en.wikipedia.org/wiki/Endgame_tablebase#Tables It seems like different parts of the chess world are a little bit divided about the best way to integrate this knowledge into the game.