The amount by which the winner beat the loser is often important – success by 5 vs. failure by 5 generally means more than success by 2 vs. success by 1! The winner’s “margin of victory” is the difference between his margin of success and the loser’s margin of success if both succeeded, the sum of his margin of success and the loser’s margin of failure if he succeeded and the loser failed, or the difference between the loser’s margin of failure and his margin of failure if both failed.