Secret Agent Chess

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

One of the opposing minor pieces is your secret agent. Immediately after the opponent moves it (not the first time), you make declare it and must then move it yourself. Your revealed agent may not capture the enemy king. Ralph Betza, 2003.

Secret Agent Chess

Chess Variants

Meet Ed

These are simple illustrations rather than strong opponents.

Bug reports? -- thank you!