Hey, greetings from Russia and thanks for a great app.
I've succesfully launched K3Chess on Kindle 4 NT. I'm leaving a short guide for those who need it. This works for jailbroken device (no usb network needed at all):
1) To install cr3runner put the
'install.bin' file and 'qtkindle' folder into your device root folder. Then update your Kindle from the 'settings' menu.
(To uninstall, do the same with the 'uninstall.bin' file).
2) Update your cr3runner by replacing 'cr3runner-2.5.azw2' file in your 'documents' folder with
cr3runner-2.6.azw2
3) Install 'k3chess' folder into 'cr3runner' folder, that was created in your device during installation (this is needed to avoid application permissions issues)
4) Replace all text in 'cr3runner/commands.txt' by this line (without quotation marks):
'/mnt/us/cr3runner/k3chess;goqt.sh;K3Chess;Chess'
5) Choose Cr3Runner from your home screen and press the 'Chess' button.
6) Enjoy
However i found it impossible to save in-game before i quit, because my Kindle has no physical keyboard and i can't press the 'Alt+Back' combination.
Please, please make it possible to reassign the quick exit button. I suffer a lot, since I can't read anything without aborting the game.