HIXT

Rules:
* On his turn a player drop a friendly stones in an empty cell, and
connects it, via a bridge, with any friendly stone (at diamond's distance)
* Stones connect via adjacency or using a bridge
* PIE rule for the second player's first move
* The player connecting two opposite edges or making a Y connecting
three non-adjacent edges, wins the game

Sample Game:

XXX === OOO
j13     o8
h7      i10
l9      o10
l11     l7
k8      o12
j5      i6
g6      f7
d7      l5
m4      s4
q4      p3
p5      s6
p15     o14
m14     r15
c10     i12
g12     b9
c8      f9
d11     m2
g2      i4
j3      j1
h1

1-0

Final position:

|a b c d e f g h i j k l m n o p q r s t u v w x y z A B C
|              x   o__ .   .   .   .   .   .                 1
|                     \__
|            x__ .   .   o__ .   .   .   .   .               2
|               \__         \__
|          .   .   x__ .   .   o__ .   .   .   .             3
|                     \__         \__
|        .   .   o   . __x__ .   x   o   .   .   .           4
|                   __/     \__      |
|      .   .   . __x __o   .   x   . | .   .   .   .         5
|             __/ __/                |
|    .   . __x __o__ .   .   .   .   o   .   .   .   .       6
|       __/ __/     \__
|  .   x   o   x__ .   o__ .   .   .   .   .   .   .   .     7
|          |      \__     \__
|.   x   . | .   .   x   .   o   .   .   .   .   .   .   .   8
|    |     |                 |
|  o | .   o__ .   .   x   . | .   .   .   .   .   .   .     9
|    |        \__      |     |
|    x   .   .   o   . | .   o   .   .   .   .   .   .      10
|                |     |     |
|      x__ .   . | .   x   . | .   .   .   .   .   .        11
|         \__    |           |
|        .   x__ o   .   .   o   .   .   .   .   .          12
|               \__          |
|          .   .   x__ .   . | .   .   .   .   .            13
|                     \__    |
|            .   .   .   x__ o__ .   .   .   .              14
|                           \__ \__
|              .   .   .   .   x   o   .   .                15
|a b c d e f g h i j k l m n o p q r s t u v w x y z A B C

Hixt is a hex variant of Twixt with some different connenction criteria. The board should be large enough so that the drama of a single bad move could not determine the match outcome. Probably, a hex board with edges of size 10 should already provide a nice battle.