Installation:
1. Rename MobileChess.zip to MobileChess.jar if necessary;
2. Copy MobileChess.jar into your mobile device;
3. Install MobileChess.jar (MobileChess.jad is also necessary in some devices).

If you can't open menu items (including "Back" and "Retract") in playing:
1. Modify META-INF\MANIFEST.MF in MobileChess.jar (Some compression tools like WinRAR can open MobileChess.jar and modify META-INF\MANIFEST.MF directly), change the value of "MobileChess-Compatible" from "false" to "true";
2. If MobileChess.jad is required in some devices, change values of "MobileChess-Compatible" and "MIDlet-Jar-Size" in MobileChess.jad according to MobileChess.jar;
3. Reinstall MobileChess.jar.
Then you can use "*", "0" and "#" instead of menu items.

For some mobiles which have no enought memory to play sounds:
1. Delete "sounds" and "musics" folder in MobileChess.jar;
2. If MobileChess.jad is required in some devices, change value of "MIDlet-Jar-Size" in MobileChess.jad according to MobileChess.jar;
3. Reinstall MobileChess.jar.