Star of Afrika - Horseshoes confusion
According to the rules on wikipedia, 


  Before the star of Africa has been found, horseshoes are useless and are discarded. After the famous diamond has been found, however, they become effective substitutes for it. Taking a horseshoe to Cairo or Tangiers when another player has the star of Africa wins the game.


This does seem to imply that if all horseshoes are found before the Star, they will all be discarded and so the person who finds the Star has a guaranteed win. 

Note that, according to the same article, the expansion changes this dynamic:


  In 2014, an expansion for the game called Retkikunnat ("The expeditions") was published, making the game more complex... As a new feature, it is now also possible to steal the Star of Africa from the player who found it.


Thus in the expansion, even if all horseshoes have been discarded, the Star can still be stolen so finding it does not guarantee that you will win.