Xuanxuan Qijing Problem 331

  Difficulty: Expert   Keywords: Problem
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...,.....,.....,...
.........O.........
......X..O..X......
......XO...OX......
.....OOXXXXXOO.....
......XOOOOOX......
...,..X..X..X..,...
......XXX.XXX......
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OTF: Black to play

Possibly the most difficult symmetric problem.

/Hints
/Solution


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