Keys "s"=save "l"=load "b"=back once
L. Legan, 1913. This was popular in Paris. Pawns can jump units of either color to the next square beyond.
Hans Bodlaender on Fortresses
Bodlaender's Chess Variants
Hans Bodlaender's Chess Applet
Ed's Chess Variants
These are simple illustrations rather than strong opponents.
Bug reports? -- Thank you! Keep them coming!