2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/143975The sequence counting the number of unique tournaments with n people is the same as the sequence counting non-tracking binary strings corresponding to n-2 radar observations with the tracking rule "3 out of 5 with loss 2." This fact allows us to build a bijection between unique tournaments and non-tracking binary strings.8 pages, 3 figuresCombinatorics05A15text