The sneak peeks were first introduced in the second edition and served as a preview of the songs in the edition. They were present in every edition since then, except in the eighth. The sneak peeks are usually posted two weeks before the first semi-final of the edition. The countries were usually divided to the sneak peeks according to their geographical location. However, in the most recent editions they are divided according to the date of their entry's revelation.
Most of the broadcasters open a poll and let people vote for their favorites from each sneak peek. Since the fourth edition, the rankings of the broadcasters in the sneak peeks were used for the betting odds with the average place of each country representing their odds to win the contest.
The betting odds were first introduced in the fourth edition but were not associated with the sneak peeks until the seventh edition. Between the fourth and sixth editions, players could bet about who they think could qualify or win the contest. Since the seventh edition, the rankings of each broadcaster in the sneak peeks were combined and the average score of each country represented their odds to win the contest. In the eighth edition as there were no sneak peeks, a different format was used for the betting odds with the users ranking the songs on a scale from 1 to 12 points (excl. 9 and 11 points).
Since their introduction in the fourth edition, the betting odds have predicted several winners right, including Denmark in the fourth and fourteenth editions as well as Ukraine in the tenth edition, Bulgaria in the twenty-first edition and Sweden in the twenty-second edition. Most of the betting odds' top 10–15 had similar result in the contest. However, there were several occasions where the favorites of the betting odds did not manage to do well, such as Turkey in the thirteenth edition or where the non-favorites of the edition did better than expected, most notably Israel in the twelfth edition.
A list with the best averages in the betting odds.
A with the worst averages in the betting odds.