http://en.wikipedia.org/wiki/Six_Men%27s_Morris From Wikipedia

"Six Men's Morris is played in the same way as Nine Men's Morris, with two changes, the first is that each player has six men and the second is that it is played on [a modified] board (which is similar to that used by Nine Men's Morris, except it lacks the outer set of lines)."

Variation: Five Men's Morris is played on the same modified board, but using 5 men on a side instead of six.

The games of Six Men's Morris and Five Men's Morris have been solved and proven to result in a draw with perfect play. A perfect playing program can be downloaded here:

http://puzzles.net23.net/6mm.htm