Fritz11 

Fritz makes it easy for you to play against other human beings, at any time, day or night. It provides you with a one-click connection to the largest chess community in the world, Playchess.com (1 year access). You can play quick and informal games at any level, take part in tournaments, or attend live lectures and training sessions. You can also watch great international events, which are broadcast live on the server, and you can discuss the moves with players and Grandmasters from all over the world. It is an experience you will not want to miss.