A hippogonal (pronounced )
chess
Chess is a board game for two players. It is an abstract strategy game that involves Perfect information, no hidden information and no elements of game of chance, chance. It is played on a square chessboard, board consisting of 64 squares arran ...
move is one similar to a
knight
A knight is a person granted an honorary title of a knighthood by a head of state (including the pope) or representative for service to the monarch, the church, or the country, especially in a military capacity.
The concept of a knighthood ...
's move. That is, a leap ''m'' squares in one of the
orthogonal
In mathematics, orthogonality (mathematics), orthogonality is the generalization of the geometric notion of ''perpendicularity''. Although many authors use the two terms ''perpendicular'' and ''orthogonal'' interchangeably, the term ''perpendic ...
directions, and ''n'' squares in the other, for integer values of ''m'' and ''n''. It need not be a 2:1 ratio for m and n. A specific type of hippogonal move can be written ''(m,n)'', usually with the smaller number first.
For example, the knight itself moves two squares in one orthogonal direction and one in the other—it moves hippogonally. It is a (1,2) hippogonal mover, sometimes referred to as a (1,2) leaper.
Other hippogonally moving pieces include the
camel,
[Piececlopedia: Camel]
by Hans Bodlaender, '' The Chess Variant Pages'' a
fairy chess piece, which moves three squares in one direction and one in the other, and thus is a (1,3) hippogonal mover. The
Xiangqi horse is a hippogonal stepper and the
nightrider is a hippogonal rider.
The pieces are colourbound if the sum of ''m'' and ''n'' is even, and change colour with every move otherwise.
Etymology
The word hippogonal is derived from the ancient
Greek , ''híppos'', 'horse' (knights used to be called horses, and still are in some languages),
and ('), meaning "angle".
[Liddell and Scott, '' A Greek–English Lexicon']
''s.v.'' γωνία
References
External links
by Fergus Duniho and
Hans Bodlaender, ''
The Chess Variant Pages''
Fairy chess pieces
Chess terminology
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