Whale Shogi

A 6x6 Shogi variant designed by Wayne Schmittberger. In Whale Shogi players have a very weak piece (the Porpoise) that if captured gives the capturing player the strongest piece of the game in hand: the Killer Whale.

Detailed rules are available on Wikipedia and the Chess Variant Pages. In this modified version, Dolphins (pawns) promote on the last rank and gain the ability to move and capture diagonally backwards.