e1, e8, f1, f8: King
Click on a piece below to see its moves
Sliding capture or non-capture,
|Unblockable leap (capture or non-capture)|
|Piece||ID||value||Moves (Betza notation)||Remarks|
|King||K||-||K||Can castle with Rook, moving 2 steps towards it|
|Queen||Q||9.5||RB or Q|
|Pawn||P||1||mfWcfF||Promotes to Q, R, B, or N on reaching last rank|
An e-file King that has not moved before can move two squares in the direction of a Rook that has not moved before, in which case that Rook is moved to the square the King skipped over. This is only allowed if all squares between King and Rook are empty, when the King is not in check on the square it came from, and would not be in check on any of the squares it skipped over.
You have a pair of Kings, and only a single Bishop. Only one of the Kings is royal, but which one can change during the game, as it depends on their relative location on the board.
It is not possible to force checkmate on a bare King with just a single Bishop or Knight (in addition to your own King). Two Knights cannot do that either. Two Kings can force checkmate on a bare King.Your non-royal King can be exposed to capture, and thus captured. After that, the remaining King will always be royal.
Once both sides are down to a single King, this variant degenerate to orthodox Chess.
The spare King is a tough defender, because it cannot be attacked by the opponent's royal King. So if all the attacker's power is in a single piece, the defending King pair has little to fear when they protect each other. This makes even KQKK is a draw (provided the Kings can connect).