Definition:Chess/Piece/Rook
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Definition
The rook 
can be moved any number of squares in any of the $4$ orthogonal directions: up, down, left or right.
It cannot be moved past a square occupied by another piece.
| a | b | c | d | e | f | g | h | ||
| 8 |        | 8 | |||||||
| 7 | 7 | ||||||||
| 6 | 6 | ||||||||
| 5 | 5 | ||||||||
| 4 | 4 | ||||||||
| 3 | 3 | ||||||||
| 2 | 2 | ||||||||
| 1 | 1 | ||||||||
| a | b | c | d | e | f | g | h | ||
Also known as
The rook is also known as the castle, mainly because of its shape.
Linguistic Note
The word rook derives from the Persian word رخ (rokh).
Sources
- 1993: Richard J. Trudeau: Introduction to Graph Theory ... (previous) ... (next): $1$. Pure Mathematics: Games