There are just too many variables to predict properly a single world cup match. Things you might not think of right away can completely change the outcome: weat

There are just too many variables to predict properly a single world cup match. Things you might not think of right away can completely change the outcome: weather, bad referees (even good referees doing just a bad call), combined strategies, bad player changes, to name just a few. It's part of the taste of watching football, you can't be too sure about what's going to happen and very often even recent history data doesn't match outcome. Perhaps this teaches how modeling highly unpredictable events shouldn't be taken lightly.