Because the King cannot move into check in its own past, and because moving a piece through time creates new boards, the game becomes a hunt. You must coordinate attacks across parallel universes. If the opponent’s King is safe on Board A (Present) but in check on Board D (Past), they can escape by moving the King on Board A. You win only when all instances of the King are under attack at once.
than your opponent. If you create more, they remain inactive until your opponent also branches. History vs. Playable Boards: 5D Chess With Multiverse Time Travel