This game is over. It was won by hexanna.

  1 a1   2 a2   3 b1   4 a3   5 b2
  6 c1   7 a4   8 b3   9 c2   10 d1
  11 b4   12 c3   13 d2   14 c4   15 d3
  16 d4

(You can click on an underlined move to show the board after that move.)