Geese must fully occupy the top endzone which is defended by Fox(es).
Geese's marbles can move one step in any direction except backwards (s, se, sw).
Foxes' marbles may move a step in every direction and can capture Geese's marbles similarly as in checkers. Jump captures have a priority over step moves.
A Fox may pass or continue with any available subsequent captures during its jump turn.
Update v2.0 (2015):
A rule allowing Fox to refuse an initial jump, (losing that piece until a subsequent jump is made by another Fox), is newly coded. The two pieces are renamed Fox1 and Fox2. When the other Fox makes a jump, then both Foxes become active again.
For Fox - a third Dummy Indicator position is displayed at the top right corner square. Click upon the DummyBlnk (Fox) to refuse an initial jump.

This 'Fox & Geese' derived game was released in Canada by Maverick Toys & Games Inc. way back in 1976 under the name 'Contra'.