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if ($player_one_race eq 'terran' && $player_two_race eq 'zerg' ||
    $player_one_race eq 'zerg'   && $player_two_race eq 'terran') {
    ...
}

my %races;
$races{$_} = 1 for $player_one_race, $player_two_race;
if ($races{zerg} && $races{terran}) {
    ...
}