SCHEMA:
CREATE TABLE table_17628022_2 (play_by_play VARCHAR, pregame_analysts VARCHAR)
USER:
How many different play-by-play announcers also had pregame analysis by Darren Flutie, Eric Tillman and Greg Frers?

QUERY:
SELECT COUNT(play_by_play) FROM table_17628022_2 WHERE pregame_analysts = "Darren Flutie, Eric Tillman and Greg Frers"