Preference is an intellectual trick-taking card game, very popular in Russia. It is a modern version of another rare Russian game VIST and similar to yet another version of VIST – BRIDGE, which is very famous, first of all, in western countries.Preference is also played, in rather different forms, in other European countries and is known as Austrian Preference, Croatian Preference, Greek Prefa.See the last updates description in "Recent Changes" section.My algorithm has not be peeping at cards of the opponents. It is the real artificial intelligence, which is simulating the behavior of the live player.If you have questions or idea, you want to discuss, please don’t write them in comments – I can’t answer. Please send me e-mail on [email protected] or post to official forum of Pref.