The Forfer (FR4)
The FR4 is a FIDE Rook whose move is limited to a distance of 4
squares (from a1 to e1, for example); to compensate for the
shortness of its move, it is also allowed to move or capture one
square diagonally.
The idea of this piece is that it has the value of a Rook, and moves
somewhat like a Rook, and so it feels like a Rook.
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