The White Whale moves like the king in Western Chess, but there is no castling.
The Dolphin moves and captures one step forward, but move back diagonally one or two steps from the far rank.
The Narwhal jumps two forward or moves one step left, right or back.
The Humpback Whale steps a square in any diagonal direction or one square backwards.
The Blue Whale steps square forwards or to any forward diagonal square or one square backwards.
The Porpoise steps a square to the left or right. Promotes to enemy Killer Whale if captured. Remains on rear rank.
The Gray Whale moves straight forward as a rook, and diagonally backwards as a bishop.
The Killer Whale: a captured porpoise that is dropped on the board. It slides any number of squares in an orthogonal direction, or steps one square diagonally.
You can also right-click on the pieces to see how they move.

Dolphins are not be allowed to move to a column that contains already two or more dolphins of the player.

On capturing the opposing Porpoise, a player adds an Orca (Killer Whale) into his reserve, and the Porpoise is permanently removed from play. So an Orca always remains an Orca, and can be captured and then dropped as an Orca as well.

Piecesets- toggle between the visual representations and the Latin firt letters.

Drops As in Shogi, pieces taken from the opponent can be used as reinforcements:
instead of making a normal move, a player can put one of the pieces he took earlier in the game from the opponent, and put this piece on an empty square; it is now one of his own pieces.

One may not drop a dolphin on the last row (at the enemies side of the board), to give checkmate, or on a column that contains already two or more dolphins of the player.

NOTE: For technical reasons the system will offer you only one out of several stored pieces of the same piece type for a drop.

 
Whale Shogi is a variant of Shogi, Japanese chess.
However, unlike most other Shogi-variants, Whale Shogi roots are not in Japan, but in the U.S., and the game also is mostly played outside Japan (although it is not clear how often).
It was invented in 1981 by R. Wayne Schmittberger (the author of New Rules for Classic Games); however, he does not mention Whale Shogi in this book.
As is more common in Shogi variants, the inventor has named all pieces after a kind of animal: in this case all are whales and related animals.

The game is mentioned in book 'The Encyclopedia of Chess Variants', and in Nostalgia, the bulletin of NOST, where John McCallion wrote about the game in the May/June 1996 issue.