Index-Match/Aggregate Help

[FONT=&quot]My problem is as follows: I have the below schedule for a series of games between 4 teams. For these games, TeamX is allowed to scout any games of their next opponent prior to the match-up with TeamX's match-up with said opponent. So for example, AvsB is Game 1, CvsD is Game 2, AvsC is Game 3. A would be able to scout Game2 because Team C is their next opponent at the time of Game 2. How I determine who a next teams opponent is formulaically, then determine which games of that opponent they can scout?[/FONT]
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[FONT=&quot]I.e., In column for, I would like to formulaically "A" in the empty column for Game # 4 & 6, because Team D is Team A's next opponent at the time Team D plays those games. The fourth column is a helper column on the assumption it is easier to match to a martial match-up given there are are two columns a team could be found in.[/FONT]
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Hi and welcome
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