Russian-English translations for задел

• beginning
  What was the beginning of the dispute?
  The author describes the main characters youth at the beginning of the story.
  That house is at the beginning of the street.
• margin
  margin of victory
  margin of error
• reserve
  The book is on reserve
  I accept your view with one reserve
  New oil reserves are continuously being discovered, but not as fast as the existing ones are running out
• start
  The movie was entertaining from start to finish.
  He woke with a start.
  Captured pieces are returned to the start of the board.