 Adding the IMPs gained gives a total of 37.To determine the average IMPs gained, divide the total by the number of competitors (37 divided by 4) to arrive at 9.25 as your averaged cross-IMP score.In the 1932 Laws of Contract Bridge, notrump tricks bid and made, and undoubled notrump tricks made but not bid, score 30, 40, 30, 40, 30, 40, 30.