“Pari-mutuel pool” or “mutuel pool” or “pool” means the total money wagered by patrons and held by a licensee under the pari-mutuel system on any horse or horses in a particular race. There is a separate mutuel pool for win, place and show, and for each of the various forms of betting as defined by the rules and regulations of the Board. Subject to the prior consent of the Board, any such pool may be supplemented by a licensee in order to guarantee a minimum distribution.