Go (Baduk, Weiqi) problems with solutions

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Go (Baduk, Weiqi) problem 1069

Black to play. 1069 Capture. Difficulty: Advanced.

(;GM[1]FF[4]SZ[19]AP[goproblems.ru]
AB[gc][ic][dd][ed][fd][be][ce]
AW[dc][ec][bd][cd]
C[1069
Capture.
Difficulty: Advanced.
]
(;B[bb];W[cc];B[ad];W[ac];B[ae];W[bc];B[fb];W[eb];B[cb];W[ba];B[ab];W[da]
;B[fa];W[ea];B[ca]
C[White dies.
])
(;B[cb];W[bb]
(;B[cc];W[bc]
C[White lives.
])
(;B[ba];W[cc];B[ab];W[bc]
C[White lives.
]))
(;B[bc];W[cc]
(;B[ad];W[bb]
(;B[ac];W[ab];B[ae];W[fb]
C[White lives.
])
(;B[ab];W[ba];B[fb];W[aa];B[ac];W[ae];B[ac];W[ad];B[da];W[bg]
C[White lives.
]))
(;B[bb];W[ad]
(;B[cb];W[fb];B[db];W[eb];B[ac];W[da];B[ca];W[aa];B[ea];W[fa];B[gb];W[ba]
;B[fc];W[da];B[ab];W[ba];B[ea]
C[One-step ko, in White’s favour.
])
(;B[fb];W[eb];B[cb];W[da]
(;B[ca];W[ac];B[fa];W[ab];B[ea];W[ba]
C[Ko (Black to start).
])
(;B[ba];W[ab];B[fa];W[ea];B[ac]
C[White dies.
])
(;B[ab];W[ba];B[fa];W[ea];B[ca]
C[White dies.
])
(;B[ac];W[ca];B[fa];W[ba];B[ea];W[ab];B[aa];W[db]
C[White lives.
]))))
(;B[ad];W[bb];B[ab];W[bc];B[ac];W[cb]
C[White lives.
]))

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