Great app! Name exported PGN files as in the PGN itself of year.month.day, and a zero prefix to make hours and minuted two-digits. Periods and other special character input when naming a PGN for export. Fischer Random. Mortal Kombat sound effects while the Mortal Kombat song is playing!! Consider a default of the light gray contrast non-marble board. The retail app should have an option to plugin engines, once that extensibility is solid it wouldnt need an update for years, that would make the app the most popular AND the most versatile, getting marketshare away from retail chess apps that can plugin engines.  // The AI database was deleted from my mobile and the application was remotely controlled by aliens. I had to uninstall the application so that I dont play them instead of Treebeard. Which is a fine engine.