My Take - From Chapter 6 (page 33) of, "Winning Without Winning."

The quality of behavior of individuals in both victory and defeat is what sportsmanship is all about.  In any sport, as in life, mistakes are inevitable.  To accept this is to understand that a person's value is not determined by his accomplishments on the playing field.  To the truly sportsmanlike individual, mistakes are learning experiences.  Properly handled, this message will be passed along to the children.