Portal Chess – Save, Load, Edit & Move History

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Porthole Chess Summary OverviewPorthole Chess is a chess variant that introduces neutral, dynamic "portholes" that both players can use. Typically, eight portholes are placed on the board at the start. These tokens are not controlled by either player but can facilitate movement and captures. Porthole Move Mechanics Entry & Exit: A piece enters a porthole and must exit from another open porthole. Entry Conditions: A porthole can be entered via a legal capture move. The entry porthole can be open or occupied by an enemy piece. Exit Conditions: The exit porthole must be open and cannot be occupied. Token Movement: Once a porthole is used, the entry porthole moves to the square where the moving piece started. Key Rules & Restrictions No Attacks Through a Porthole: You cannot capture a piece on an exit porthole. Blocking & Neutrality: Portholes act as obstacles and cannot be passed over. Pawn Movement: Pawns must enter portholes diagonally and cannot move straight onto them. No En Passant: This move is not permitted in Porthole Chess. Pawn Promotion: A pawn must move onto the last rank (not through a porthole) to be promoted. Porthole States Open: Unoccupied and available for entry/exit. Occupied: Contains a piece; cannot be used for exit. Active: A porthole activated by a capture move. Dormant: A porthole covered by another porthole. Stoned: The last open porthole if all others are occupied; it cannot be entered. Strategic Impact King Safety: Portholes offer escape routes and tactical maneuvering. Piece Mobility: Bishops can switch colors, rooks have more options, and pawns can reposition. Game Complexity: Portholes constantly shift, requiring adaptive strategies. Porthole Chess adds a layer of tactical depth to traditional chess, making every move a potential surprise.