Actuated Rotating Center Chess

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

The four center squares rotate under certain conditions. This applet lets you try many different options. In the original version by AE Farebrother and WH Rawlings, the center squares along with any occupants made a quarter-turn clockwise whenever a piece entered it, moved within it, or left it.

Chess Variants

Meet Ed

These are simple illustrations rather than strong opponents.

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