The Attacker has to get two Men into the fortress (centre).
The Defender wins if the Attacker has only one Man left or by threefold repetition.
You start as the Attacker.
 
The Attacker has seven Men, the Defender four Men. The Attacker may only move sideways or forward.
The Defender may move sideways, forward or backwards. The Defender may not enter the fortress. However, he can capture a Man inside the fortress by jumping over it to the opposite side.
 
Both players capture by jumping over an adjacent enemy Man.
 
One eighth of the board is especially marked as the NEUTRAL ZONE. Men positioned in the neutral zone cannot be captured.
 
Ringo was invented in Germany. Source: Waddingtons Illustrated Encyclopaedia of Games.
 
 
For more freeware as well as real puzzles and games see my home page http://karl.kiwi.gen.nz.