Knight's move was a divine transmutation or alteration spell similar to blink that teleported the caster diagonally for a surprise attack or a surprise escape, making it a favorite of Red Knightist clerics.
When cast, this spell caused the caster to instantaneously transit the Astral Plane and reappear a short distance away, in the manner of a knight-errant chess move—in a spot two-thirds the total distance in one direction and the remaining third in a perpendicular direction. The maximum linear distance that could be teleported was 30 ft (9.1 m), broken into two steps: 20 ft (6.1 m) in one direction and 10 ft (3 m) in a perpendicular direction. Higher level casters could extend this range but the movement was always in two-thirds/one-third proportion.
If the point of arrival was already occupied by a solid object, the spell fizzled.
An earlier version of this spell allowed the caster to make more than one knight's move as desired, but in lieu of any other action, before the spell expired. It was also less constrained on the destination, allowing the caster to blink to any location in sight as long as it was within range (which was determined by the level of the caster, but no more than 120 feet or about 37 meters away).