***assertion failure:
board.c:909 - board[pos] == EMPTY near E4***

 (variation 15868)
   A B C D E F G H J K L M N
13 . X O . . . . . . . . . . 13
12 O O . O O O . . O . O O O 12
11 . . . . O . O O O O O O O 11
10 O O O O O O X X X X O . O 10
 9 X X O X X O X . X O O . O 9
 8 . X O X X X . X X X X O O 8
 7 X . X X . . X X O O O O O 7
 6 X . . X X X . X X X X O O 6
 5 X . . . . X X X X X X X X 5     WHITE has captured 11 stones
 4 . X . X X . + X . + X . X 4     BLACK has captured 28 stones
 3 . X X O X . . . X . . . X 3
 2 . O O O X X . X X X X . X 2
 1 . . . . X . . . . X X X . 1
   A B C D E F G H J K L M N

gnugo 3.2 (seed 1043494689): You stepped on a bug.
Please save this game as an sgf file and mail it to address@hidden
If you can, please also include the debug output above this message.