how can I change the screen resolution in chessmaster challenge?
800x600 doesn't look very good on my huge TFT..

Preferences--Layouts

if it even has this options. Chessmaster Challenge is just very very very light version of Chessmaster 10th Edition.

even if it's very light, it's fun

but unfortunatelly there's no menu aside from "sound" (it's the steam version).
Is there a way to tweak the local.ini?

I don't know. Don't remeber much about CM Challenge anymore.