Octopus Chess

Octopus Chess features 2 new exotic pieces that possess unusual moving abilities. The game also uses augmented knights instead of regular knights and 5 additional pawns that can be dropped during play.

The new pieces are:
The Octopus: - A powerful crooked slider that controls multiple files, ranks and diagonals.
The Sorcerer Snake: A piece that follows one of two crooked paths to squares that are a Knight's move away or an extended Knight's move away.
The Ninja Pawn:- A stronger pawn can also move sideways anywhere and capture sideways on the enemy half of the board.
The Ninja Pawn is not present in the intial setup but is dropped during play into a vacant space on the second rank. It can be optionally pushed forward on the same turn.
The Knights are replaced by the Ferz-Knight and the Wazir-Knight which make additional diagonal or orthogonal stepping movements.

Otherwise, the rules are exactly as in orthodox chess except for: Flexible castling (King can castle by moving 1, 2 or 3 (or 4 on Q-side) spaces towards rook, modified movement of the standard pawns and associated extended en-passant rules.

Board Setup

Start Position for Octopus Chess
black ninja pawn black ninja pawn black ninja pawn black ninja pawn black ninja pawn
The board is set up as follows for the white side (black side will mirror this):

Rook on a1
Wazir Knight on b1
Bishop on c1
Sorcerer Snake on d1
Queen on e1
King on f1
Octopus on g1
Bishop on h1
Ferz Knight on i1
Rook on j1
10 pawns from a2 to j2.

Note that the lower right square is white, and that kings occupy the same color square.

5 Ninja pawns to be dropped one per turn into empty space from a2-j2
white ninja pawn white ninja pawn white ninja pawn white ninja pawn white ninja pawn

Pieces and movement

The Octopus
Moveset of Octopus The Octopus takes one of two unobstructed paths:
The Octopus can go to the green squares by taking 1 diagonal step followed by two or more orthogonally outward steps.

Or it can go to the blue steps by taking 1 orthogonal step followed by 2 or more diagonally outward steps .

The Octopus captures by replacement only. It cannot jump and must travel via vacant squares along the specified paths.

The Sorcerer Snake
Moveset of Sorcerer Snake The Sorcerer Snake can go to the green squares by taking either 1 diagonal step followed by 1 orthogonally outward step OR one orthogonal step followed by 1 diagonally outward step.
Since b3 is occupied by a black pawn, it cannot move there.

The Sorcerer Snake can travel to blue squares by taking one orthognal step followed by 2 diagonally outward steps
OR it can go to the same square by taking 2 diagonal steps followed by one orthogonally outwards.

Both paths must be blocked for it not to be able to make it to the destination square.
The pawn at b3 blocks one path to a2 and the pawn at b2 blocks the other, so it cannot get to a2.
The Sorcerer Snake captures by replacement only.

The Standard Pawn Moves exactly as in standard chess except:
The pawn can move from its original position either 1, 2 or 3 vacant squares forward.
If it previously moved only 1 space originally or captured from original position, it can move forward two spaces towards the center.
En-passant is logically applied to meet these changes.
From the middle (rank 5 for white, rank 6 for black), it can step only 1 space forward into the upper half of board, but from thereafter it can go one or two vacant spaces forward.
For example, a pawn can start at e2 push forward to e5 then make one step to e6 then go e8, and promote at e10 in 4 moves!
Note that if a pawn makes the two step pawn move and bypasses an enemy pawn, it can be captured en-passant.
The Ninja Pawnwhite ninja pawn black ninja pawn

The ninja pawn can always move 1 square up or 1 square sideways to an empty square regardless of where it is situated on the board.

When the pawn is situated in the lower half of the board (for White, rank 1-5 and for black 10-6), it can move forward multiple vacant squares (1-3 squares) to reach the middle of the board (rank 5 for White or rank 6 for Black). This move can be done at any time regardless of how many times the pawn has moved.
Thus White can on each turn move from e2-e3, e3-d3 and d3-d5.

From the middle exactly, (rank 5 for white, rank 6 for black), the ninja pawn can move only 1 square forward, but thereafter as soon as it enters enemy territory (the upper half of the board: White rank 6-10, and for black rank 5 - 1), the pawn can go forward either 1 OR 2 empty spaces.

Like the standard pawn it can capture one square diagonally up, regardless of which half of the board it is on.
When the ninja pawn is on the top half of board (White rank 6 +, Black rank 5-) , it can also capture one square horizontally.

There is no en passant. It cannot capture another pawn or ninja pawn en passant nor can any other pawn capture it this way.

Promotion: The ninja pawn promotes on the last row (rank 10 for white, rank 1 for black), to any piece. Promotion to a piece is mandatory so it would cease to be a pawn in the last row.
Note that like the standard pawn, it can reach the promotion square from its start position in a minimum of 4 moves!

Dropping: 5 Ninja Pawns can be dropped (1 per turn) into an empty space on the 2nd rank by either side during the course of play. The Ninja Pawn can be optionally pushed forward (1-multiple spaces) towards the middle during the same turn.
It cannot make a capture on the same turn as the drop.

The Ferz-Knight - moves like a knight or makes one step diagonally.

The Wazir-Knight - moves like a knight or makes one step orthogonally.

Play the Game

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