Yes, PyChess could be a good choice to get something up for Maemo, Moblin and GNOME desktops. However, I have a personal interest in seeing how this Qt cross-platform strategy turns out to be in reality, specially when it comes to Maemo-Symbian compatibility.

This is why I find Qt 4.6 as a starting point worth trying even if it's clearly not the fastest path to get something done for Maemo 5.