6 men's morris is a game which was popular during the middle ages but is virtually unknown now.
It has the same rules than 9 men's morris, also known as triples, but uses a smaller board.
The official rules, from the World Merrills Association, can be found here
Nevertheless, I've solved it.
It is a draw when both players play perfectly.
5 men's morris, which uses the same board but only 5 men is a draw too.
If both players use 7 men, it is a draw too.
I've demonstrated this by creating a program which plays all this perfectly.
Interestingly, the deepest (reachable) position in 6 men's morris was a mate in 149, which can be played as well.
The computer always plays red.
To improve the program, minor changes have been made to the database.
To download, press here (6 Mb)
I have also solved 7 men's morris, which has the same rules but is played on this board.
I found it a very strange variant because, as you can see, there are 2 lines with 5 intersections.
This often results in a big dominance if one owns this spot.
And indeed, it is a win for the first player in 25 moves with perfect play.
Even more, if the first player doesn't put his first pawn on the central square, it is a win for the second player !
So it might be a good suggestion to not use the central square until all panws have been placed on the board.
But still, I haven't found anything by which I could conclude these are the not the right rules after all.
7 men's morris isn't available due to the size of the database, about 100Mb.
That's because, there's a higher % of winning lines, there's 1 spot more on the board and the symmetry between the outer and inner square is broken.
Move on to 4 field ko-no
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