XuanxuanQijingProblem53/Solution

..........
..........
..........
.X.,.....,
..........
.XXX......
.OOOX.....
....X.....
.B8...X....
..OOOX...,
.B2B1XOX....
B6B3B4B5X.....
..B7.......

OTF: Main line (1)

B1 to W8 sequence is natural. Next sequence may be the real problem.

..........
..........
..........
.X.,.....,
..........
.XXX......
B3OOOX.....
B4.B7aX.....
.OB6B5.X....
B1.OOOX...,
B2OXXOX....
OX.XX.....
..X.......

OTF: Main line (2)

B9, B11, and B13 sequence is critical. White cannot move to a because of shortage of liberties.

..........
..........
..........
.X.,.....,
..........
.XXX......
B1OOOX.....
B2..B4X.....
.O..B6X....
B3.OOOX...,
B5OXXOX....
OX.XX.....
..X.......

OTF: wrong order - Failure

For B9 first, White can live.

..........
..........
..........
.X.,.....,
..........
.XXX......
B4OOOX.....
.B8B7B2X.....
B9O.B6B5X....
B1B0OOOX...,
B3OXXOX....
OXOXX.....
.Ba.......

OTF: Easy to mistake

black+circle instead of a is a mistake, too. White can catch B9 by oiotoshi.

..........
..........
..........
.X.,.....,
..........
.XXX......
B8OOOX.....
.B7..X.....
.B0B9b.X....
.aOOOX...,
..B2XOX....
B6B4B1B3X.....
.B5........

OTF: Attempt

For B1, white can live at least by ko.


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