Chess by Cellufun is a well-presented recreation of the game of kings with a very clear board and an intuitive control system.
Before you start playing Cellufun's Chess there are lots of options to play around with. You can add a clock timer, set the AI level of the computer opponent, choose a side to play on, and much more. There's also a neat Stats menu that lets you keep track of how many games you've played, how many you've won and how many you've lost. You can even choose to play Chess online against a human opponent, though obviously this can become pricey if you have a pay-as-you-go-style phone contract setup.
In terms of its in-game options, Chess by Cellefun is a little more limited, and you can only really undo moves or forfeit the game. It would've been nice to see a Hints option or at least some basic instructions on the game of chess for beginners.
Nevertheless if you want a dose of chess to take on the bus with you, Cellufun's Chess is a polished, enjoyable affair.