OROUBORUS

Players take turns moving both ends of the slime-worm, each to some
adjacent cell.  After each move, each end leaves a stone of that
player's colour.  The worm may not move onto a coloured cell.

If at some point before the board is full, a worm-end cannot move normally,
the next player who is able to must split the other end into two heads.

A player wins if he makes a 3 in-a-row with his stones.
If both ends become blocked simultaneously, the last player to move wins.

Game sample:

J starts  
nw.e  w.se  w.ne ne.e   e.sw  nw.se
w.w sw.sw sw.w  se.w  se.ne   e.w  
B wins

Final Position:

       . . . . .
      j b . . . .
     b b j . . . .
    j j b j . . . .
   . b . .[b]j j b .
    . J B . . b j .
     . . B J . j b
      . . b j b .
       . . . . .