While chess is seen as one of the most dignified sports in existence, it is also one of the most ruthless, aggressive and unforgiving. The PC version of Stockfish has been heralded as the second strongest chess programs in existence.

When playing against a computer opponent, the game can be configured in a variety of ways. With numerous playing style to choose from - including Passive, Active and Suicidal - the app is not only always available for a game, but is able to provide a number of different challenges.

You can opt to play against the computer, play against a human competitor, or play both sides yourself. There is also the option of saving games as PGN files that can then be emailed to others to share your game - other you can indulge in a little email chess.

Stickfish Chess may not be much to look at, but it puts up a serious challenge. The customisable board is always available wherever you may be, and you can use the app's game recording to analyse the moved you have made afternoon.