Question: If the date is 7-21-2006, who was the opponent?
SQL: SELECT "Opponent" FROM "1-23314951-4" WHERE "Date" = '7-21-2006';

Question: If the opponent is Kristian Pless, who was it against?
SQL: SELECT "Against" FROM "1-23314951-4" WHERE "Opponent" = 'Kristian Pless';