Fusion Chessgi

by Fergus Duniho

Fusion Chessgi is a hybrid of Fusion Chess and Chessgi. It is a game in which pieces may combine together, split apart, and change sides.

Equipment

It's might be best to play this game with a computer interface, such as with Zillions of Games, but if you like, you may play it with a regular 8x8 Chess board and two or more sets of Chess pieces. You can represent compound pieces with pairs of pieces. However, if you do it this way, you will have to divide up your in-hand area, so that you can clearly tell which are compound pieces, and which are simple pieces being held in hand. It may be better to at least have specially made Marshall and Paladin pieces. You can make these by affixing small rooks and bishops to larger knights, or vice-versa. I recommend using Friendly Plastic for this. Or you could just buy some sets for Gothic Chess.

Setup

The initial setup for Fusion Chessgi is exactly the same as for regular Chess. So there is no need for a diagram.

Rules

Fusion Chessgi is played like FIDE Chess with the following exceptions:

A simple piece (King, Knight, Bishop, or Rook) may combine with another non-royal simple piece by moving onto its square.
- The combined piece is the piece which moves as either of the two pieces just combined.
  - King + Bishop = Pope
  - King + Rook = Dragon King
  - King + Knight = Eques Rex
  - Bishop + Rook = Queen
  - Bishop + Knight = Paladin
  - Rook + Knight = Marshall
- A piece may not combine with another piece of the same type.
  - Knight + Knight = Rook + Rook = Bishop + Bishop = Illegal.
- A non-royal piece may not move to combine with a King, but a King may move to combine with a non-royal piece.
- A piece may combine only with a piece belonging to the same player.
- Compound pieces may not combine with other pieces.
A compound piece may split into its components by moving one of its components, under its own powers of movement, to an empty square.
- A Rook which separates from a piece must move away as a Rook moves.
- A Bishop which separates from a piece must move away as a Bishop moves.
- A Knight which separates from a piece must move away as a Knight moves.
- A King which separates from a piece must move away as a King moves.
- The compound piece is replaced by the component which doesn't move away.
There is no castling.
Pawns may promote to Rook, Bishop, or Knight, but not to any compound piece.
The object is to checkmate your opponent's current royal piece, which may be a King, Pope, Dragon King, or Eques Rex.

Captured pieces change sides and on a subsequent turn may be dropped on an empty square by the player who has captured the piece.

Pawns may not be dropped on the last rank.

Pieces

King	The King moves one space in any direction, but may not move into check. The King is one of four possible royal pieces which a player may have. A King may merge with a Bishop to form a Pope, with a Rook to form a Dragon King, or with a Knight to form an Eques Rex. If any one of these pieces gets checkmated, you lose.
Pope	The Pope moves as a King or Bishop, but may not move into check. The Pope is a royal piece and is formed when a King merges with a neighboring Bishop. When the Pope is on the board, it is the player's only royal piece, and the game is lost if it is checkmated. The Pope may split into its components by making a non-capturing move with one of them.
Dragon King	The Dragon King moves as a King or Rook, but may not move into check. The Dragon King is a royal piece and is formed when a King merges with a neighboring Rook. When the Dragon King is on the board, it is the player's only royal piece, and the game is lost if it is checkmated. The Dragon King may split into its components by making a non-capturing move with one of them. The name for this piece is borrowed from Shogi.
Eques Rex	The Eques Rex moves as a King or Knight, but may not move into check. The Eques Rex is a royal piece and is formed when a King merges with a neighboring Knight. When the Eques Rex is on the board, it is the player's only royal piece, and the game is lost if it is checkmated. The Eques Rex may split into its components by making a non-capturing move with one of them. The name is Latin for Cavalier King.
Knight	The Knight moves as the Knight in Chess, jumping in an L shape, two spaces forward and one to the side. A Knight may merge with a Rook to form a Marshall or with a Bishop to form a Paladin.
Rook	The Rook moves as the Rook in Chess, any number of spaces orthogonally. A Rook may merge with a Knight to form a Marshall or with a Bishop to form a Queen.
Bishop	The Bishop moves as the Bishop in Chess, any number of spaces diagonally. A Bishop may merge with a Knight to form a Paladin or with a Rook to form a Queen.
Queen	The Queen moves as the Queen in Chess, any number of spaces in any single direction. The Queen is a combination of Rook and Bishop. It may separate into its components by moving one of them to an empty space.
Marshall	The Marshall moves as a Rook or Knight. The Marshall is a combination of Rook and Knight, and it may separate into its components by moving one of them to an empty space.
Paladin	The Paladin moves as a Bishop or Knight. The Paladin is a combination of Bishop and Knight, and it may separate into its components by moving one of them to an empty space.
Pawn	The Pawn moves as the Pawn in Chess. It moves forward one space, but is allowed a double move on its first move. A Pawn captures by moving one space diagonally forward. If a Pawn makes a double move to a space alongside an enemy Pawn on its fifth rank, the enemy Pawn may capture it by en passant. Upon reaching the last rank, a Pawn may promote to a Rook, Bishop, or Knight. It may not promote to a Queen, Marshall, or Paladin.

Notation

Use algebraic notation as you would for Chess. Use P to denote Paladin and M to denote Marshall. Denote Pawn moves without the use of any letter to identify it. When a piece merges with another piece, follow the move with = and the abbreviation for the new piece. For example, R a4 - d4 = M indicates that a Rook moved from a4 to d4 and merged with a Knight on d4 to form a Marshall. When a piece separates from a compound piece, identify the move as belonging to the piece which moves away from the compound piece. Follow its move with a semicolon and identify what piece is left behind. For example, R a4 - d4; a4 = N indicates that a Rook moved to d4, separated from a Marshall at a4, and left a Knight behind at a4. For drops, use an asterisk in place of the coordinate for the square it is moving from. For example, P*e4 means a Paladin was dropped on e4, and *d7 means a Pawn was dropped on d7.

Software

I developed Fusion Chessgi with Zillions of Games, an AI program for playing different board games, and you may download my Zillions Rules File for playing Fusion Chessgi from chessvariants.com.

fusion-chessgi.zip