CREATE TABLE table_name_84 (opponents VARCHAR(255), date VARCHAR(255), score VARCHAR(255), competition VARCHAR(255))
Score of 2-1, and a Competition of pl, and a Date of december 22, 2006 had what opponents?
    
SQL: SELECT opponents FROM table_name_84 WHERE score = "2-1" AND competition = "pl" AND date = "december 22, 2006"