If you had a Java-capable browser, you could play Turkish Coup Chess here.
Keys "s"=save "l"=load "b"=back once

Ralph Betza, 2003. You may make a different piece (not pawn) royal if not in check. No piece may be royal twice until all survivors have been royal once.

Ralph Betza called this Ataturk Chess in honor of the provision, in the secular Turkish constitution, allowing the military to overthrow an administration that became too theocratic.

Chess Variants

Meet Ed
Bug reports? -- thank you!