SQUIRM

DROP - On each turn, pass or drop 1 or 2 stones into empty cells.
SNAKE - A maximal connected group of stones of the same color, with each stone adjacent to either 1 or 2 friendly stones.

GOAL - If two successive passes, the recursively longest snake wins.

    __OO_______XX___
 1.  .. e5    h4 h6
 2.  g3 g7    f4 f6
 3.  i5 d6    j4 j6
 4.  k5 e7    d4 j8
 5.  l4 k7    k3 m3
 6.  n4 i7    o3 o5
 7.  p4 l8    n8 k9
 8.  q5 m9    c5 p6
 9.  o7 g9    b6 h2
10.  i1 d2    f2 m1
11.  e1 e9    g1 k1
12.  g5 i9    resign

Final Position:

| abcdefghijklmnopqr
|     o x o x x       1.
|    o x x . . .      2.
|   . . o . x x x     3.
|  . x x x x o o o    4.
| . x o o o o . x o   5.
|  x o x x x . . x    6.
|   . o o o o . o     7.
|    . . . x o x      8.
|     o o o x o       9.
| abcdefghijklmnopqr 10.
XX resigns not because the 1st group is bigger. In fact, the first two groups will be equal: 1st have size 15, then the next groups have size 7. Only then, the 3rd o-group have size 3, while the x-group has size 2

If the players made all the moves, the board would become:

| abcdefghijklmnopqr
|     o x o x x       1.
|    o x x o . .      2.
|   . o o o x x x     3.
|  . x x x x o o o    4.
| . x o o o o x x o   5.
|  x o x x x x o x    6.
|   x o o o o . o     7.
|    x x x x o x      8.
|     o o o x o       9.
| abcdefghijklmnopqr 10.