One of the older card games that is still enjoyed today is called Whist.  If you are a card player, the odds are that you have played Whist in at least one of its forms at some point in your life.  These forms come and go, but some of the types that have withstood the test of time are Call Ace Whist (a version most popular in Denmark), as well as Minnesota Whist (which hasnít any trump cards), German Whist (which involves only two players), and even Hokm (a version from Iran).  Typically speaking, Whist requires two teams of two ñ that is, four players.

I did not understand whist but this site helped me:
http://www.bbc.co.uk/dna/h2g2/alabaster/A647516