Contract Case Needs Explanation

Fred Gore, under the name of M.R.B. was engaged in developing and marketing computer software for controlling feeding programs for dairy cattle. Marvin Marshall went to work for M.R.B under a contract that provided that after termination of the employment, Marshall would not engage for 2 years in the business of developing or marketing computer software or in any business that competed with M.R.B. Marshall left the employment for M.R.B. to work for IBM developing a remotely operated keyboard. Should M.R.B. prevail in preventing Marvin from working at IBM? What issues are involved?