Matoca is a 1973 game from publisher Alabe Products.
Bruce Whitehill kindly sent me following scans of the game:
Played in a 5 hexhex board.
For the first turn, first player drops one stone, second player drops two. After that, a turn is to place two stones, or three if the opponent's biggest group is bigger than the player's (recursively). Passes are always legal instead of placements.
When the board is full, the recursively-largest connected group wins.
Sample game:
___OOO________XXX___
1. .. i5 k3 f4
2. o3 l4 f6 h2 h6 k5
3. i3 o5 k7 h4 j4 g5
4. g7 i7 n6 d2 m7
5. n4 e5 l6 c5 l2 d2
6. b6 d6 n2 a5 l6
7. j6 j8 o7 f8 k9
8. h8 g9 b4 m3 m5
9. e7 d8 i9 p6 q5
10. j2 g3 f2 g1 i1
11. k1 e3 c3 m1 e1
12. c7 e9 p4 n8 m9
Final Position:
| abcdefghijklmnopq
| x x x o x 1
| x x x o x x 2
| x o o o x x o 3
| x x x x x o o o 4
| x x o x o x x o x 5
| o o o x o o o x 6
| o o o o o x x 7
| o x o o x x 8
| o o x x x 9
| abcdefghijklmnopq
Groups sizes:
Os: size 23, 5
Xs: size 23, 9 X wins
Notice the recursive aspect of the goal. This is a quite interesting idea to apply in games where it's not difficult to draw (and we like to avoid draws, of course).
The board:
Bruce Whitehill kindly sent me these rule sets and related information. Also check his website, The Big Game Hunter.