/// MaterialInfo::scale_factor takes a position and a color as input, and
-/// returns a scale factor for the given color. We have to provide the
+/// returns a scale factor for the given color. We have to provide the
/// position in addition to the color, because the scale factor need not
/// to be a constant: It can also be a function which should be applied to
/// the position. For instance, in KBP vs K endgames, a scaling function
/// MaterialInfo::evaluate applies a specialized evaluation function
-/// to a given position object. It should only be called when
+/// to a given position object. It should only be called when
/// specialized_eval_exists() returns 'true'.
inline Value MaterialInfo::evaluate(const Position& pos) const {