No Entry Chess

If you had a Java-capable browser, you could play No Entry Chess here.
Keys "s"=save "l"=load "b"=back once

Chess Variants

After you move, you designate an empty square that the opponent may not occupy. The program requires you to do this. The same player may not designate the same square on three successive turns. D. B. Pritchard, 1989.

There is another version in which the barred square may not be crossed. I do not know whether it is lawful to escape check or mate simply by barring a square.

Meet Ed

These are simple illustrations rather than strong opponents.

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