text: from features.move import Move
  
  
  class PrevMove(Move):
  
      # TODO: replace this with an attribute which specifies columns
      @classmethod
      def from_row(cls, row):
          return cls(row.prev_fen, row.prev_move)
  
      def features(self, prefix=None):
          return super(PrevMove, self).features(prefix="prev_move")
  