Ill. Admin. Code tit. 11, § 301.40
a) The amounts wagered to show on the first three betting interests to finish are deducted from the net pool, the balance remaining being the profit; the profit is divided into three equal portions, one being assigned to each winning betting interest and divided by the amount wagered to show on that betting interest, the resulting quotient being the profit per dollar wagered to show on that betting interest. The net show pool shall be distributed to winning wagers in the following precedence, based upon the official order of finish:
b) If there is a dead heat for first involving:
c) If there is a dead heat for second involving:
d) If there is a dead heat for third involving: