CREATE TABLE table_name_84 (opponents VARCHAR, date VARCHAR, score VARCHAR, competition VARCHAR)

Score of 2-1, and a Competition of pl, and a Date of december 22, 2006 had what opponents?
SELECT opponents FROM table_name_84 WHERE score = "2-1" AND competition = "pl" AND date = "december 22, 2006"
SELECT "opponents" FROM "table_name_84" WHERE "2-1" = "score" AND "competition" = "pl" AND "date" = "december 22, 2006"