The diagram shown by mikhas above is now implemented in Miniature 0.1.3-1 (screenshots), available in Maemo 5 Extras-devel, Maemo 5 Extras-devel, a repository recommended only to developers. You can test the Ubuntu version too. Feedback welcome!

New features in the last version:

* Candidate UI to move pieces: one click to select piece, second click to select destination square and click to an external button to confirm the move. Pieces and squares can be changed at will before clicking the confirmation button.
* Checks are detected now.
* Backend fixes improving the responsiveness of the moves.

Features implemented in previous releases:

* Boot a screen in portrait mode.
* Display a nice-looking board.
* Set the pieces in starting position.
* Enforce basic chess rules except:
o Checkmate
o Stalemate
o Castling
o En-passant
o Pawn promotion (works in the desktop version)