by Gregory Strong
The standard rules of Orthodox Chess apply, with the following exceptions:
The Knights and Bishops are Polymorphs.
Polymorphs move like a Knight when they are in the form of a Knight, and like a Bishop when in the form of a Bishop.
On a turn, instead of making a normal move, a player may transform one of his own Polymorphs that is in the form of a Bishop into that of a Knight, or vice versa.
Additionally, a Polymorph may also take the form of a Knishop or a Bishight with such a transformation move. The Knishop moves forwards like a Knight, and backwards like a Bishop; the Bishight is the other way around.
II. Opening Setup
White always starts with the standard Chess setup, but as a consolation for moving second, Black gets the benefit of selecting his setup from the following four options:
- the standard Chess setup
- all four of Black's Polymorphs are Knights
- all four of Black's Polymorphs are Bishops
- Black's Bishops are Bishights, and Knights are Knishops
III. Pawn Promotion
A pawn, upon reaching the eigth rank, promotes to either a Queen, a Rook, or a Polymorph in any of the four forms, at the owner's discression.
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