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

David L Smith's acclaimed game. Moves must keep all units on the board connected, including check threats. No castling, promotion, pawn-two, en passant. For programming, I had to keep this in 10 x 10.

Hans Bodlaender's Chess Variants

Chex review
Chex server

Ed's Chess Variants

Meet Ed

These are simple illustrations rather than strong opponents.

Bug reports? -- Thank you! Keep them coming!