
Rules for Metamachy Chess
Presentation
It is a board game for 2 players using a 12x12 squares board.
There are 60 (5x12) pieces of 12 different types: King, Queen, Eagle,
Lion, Prince, Bishop, Knight, Camel, Rook, Cannon, Elephant and 12
Pawns.
There is a choice of 12 different starting setups. Black chooses the setup and White makes the first move.
Goal is checkmate the opposing King.
Moves
King: moves 1 step in every
(8) directions on a not attacked square. The King is in check if it is
attacked by one or several ennemy pieces. It is forbidden to play a move
letting his King in check. At his first move, the King can make a
2-steps jump, horizontally, vertically, diagonally or like a Knight,
providing that he is not in check and that the overpassed and the
arrival squares are not under attack. The overpassed square may be free
or occupied.
Queen: slides to any square along the file, the rank or a diagonal on which it stands.
Eagle: moves one square
diagonally and then, slides away of an indefinite number of cases
vertically or horizontally. It is authorized to go only one square
diagonal. It can not jump and the unobstructed path must start with the
diagonal movement.
Lion: moves as a King (a
single step move in any direction), or may jump to a position two
squares away, jumping in any orthogonal or diagonal direction, or
jumping as a Knight.
Prince: a non-royal King
who moves and captures one square in any direction, but without being
hindered by check. Like the Pawn, he can also move without capturing to
the second square straight ahead. When he reaches the last row it can
promote to one of the three major pieces: Queen, Lion or Eagle.
Bishop: slides to any square along a diagonal on which it stands. Note that it always stays on the same color of square.
Knight: jumps to the
opposite case of a 2x3 rectangle. No matter what the intermediate case
contains. Note that it always change the color of square at every move.
Camel: jumps to the
opposite case of a 2x4 rectangle, like an extended Knight. No matter
what intermediate cases contain. Note that it always stays on the same
color of square.
Rook: moves to any square along the file or the rank on which it stands.
Cannon: moves without
taking like a Rook, but it takes by going in a straight horizontal and
vertical line and jumping over exactly one piece. When a Cannon takes a
piece, there must be exactly one piece between the original and final
square of the Cannon's move - this piece may be of either color.
Elephant: moves one or
two squares diagonally. When an Elephant moves two squares, no matter
what intermediate cases contain. Note that it always stays on the same
color of square.
Pawn: can move straight
forward one or two square from any position on the board, without
capturing. It captures one square diagonally forward. As a consequence,
the en-passant capture is possible every time an opposite Pawn or Prince
has advanced two squares. When he reaches the last row it can promote
to one of the three major pieces: Queen, Lion or Eagle.
Setup rules
At the beginning all pieces but the Kings, Queens, Eagles and Lions are placed.

Then, Black freely decides where to place his King, Queen, Eagle and Lion on squares f1, g1, f2 and g2.
Then, White put his pieces symetrically in mirror (if Black King is on f1, White King goes on f12) and makes the first move.
This agreement balances the advantage of White starting to play with Black choosing the setup.
As pieces are placed in mirror symetry, positions of Kings on f
squares are exactly equivalent of positions of King on g squares. Then,
it can be demonstrated that it exists 12 different starting positions:
- The King can be on f1 or f2: 2 choices
- Then, the Queen has a choice of 3 positions: beside the King, beneath the King or diagonal to the King.
- Then, the Eagle has a choice of 2 remaining positions.
- Then, the left place is for the Lion. 2x3x2 = 12.
1 of the 12 possible starting positions