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/ˈnaɪtraɪdər/ noun. 1. a fairy chess piece that can move any number of unobstructed knight moves in a single direction (Betza = NN); also sometimes called "knightmare" Example: If a black nightrider is on a1, and b3, c5, and d7 are all unobstructed, the nightrider can go a1-d7. However, if there is a piece on c5, the nightrider cannot go to d7 as it is obstructed by c5 (however, like any other orthodox chess piece, if the obstructing piece is of the opponent, the nightrider can take on c5 from a1, assuming b3 is not occupied).
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