MySQL and inserting rows only if they does not exist

I have MySQL database with the following table:

CREATE TABLE points
(
  competition_id INT(10) UNSIGNED NOT NULL
  , user_id INT(10) UNSIGNED NOT NULL
  , pts INT(10) NOT NULL

  , PRIMARY KEY (competition_id, user_id)

  , INDEX (competition_id)
  , INDEX (user_id)
) ENGINE=InnoDB CHARACTER SET latin1 COLLATE latin1_swedish_ci;

Code (SQL):

I should insert several rows. If a row exists, it must be skipped. If a row does not exist, it must be inserted. It is not allowed to modify the existing rows.

I have a couple of ideas, but will these work at all? How would you do this?

1)

INSERT IGNORE INTO points (competition_id, user_id, pts)
VALUES (1, 2, 3), (4, 5, 6)

Code (SQL):

2)

INSERT INTO points (competition_id, user_id, pts)
VALUES (1, 2, 3), (4, 5, 6)
ON DUPLICATE KEY UPDATE competition_id = competition_id

Code (SQL):