[babuskov]

Yup, especially for strategies. It's much easier to touch the position with your finger then having to drag mouse across the screen.

[Retric]

That only works on a simple boards. Chess is 8x8 and feels cramped on a 4" screen. Go at 19x19 takes scrolling or zoom then click which slows down input. For a more complex board you end up being vague or spending lots of time fighting the UI.