Go (Baduk, Weiqi) problems with solutions

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Go (Baduk, Weiqi) problem 2454

Black to play. 2454 Making life. Difficulty: Advanced.

(;GM[1]FF[4]SZ[19]AP[goproblems.ru]
AB[cb][fb][cc][fc][dd][ed]
AW[db][hb][dc][hc][bd][cd][gd][de][fe][bf][cf][gf]
C[2454
Making life.
Difficulty: Advanced.
]
(;B[bc];W[ac]
(;B[ab];W[ca]
(;B[bb];W[ad]
C[Black dies.
])
(;B[ad];W[ba]
C[Black dies.
]))
(;B[ca];W[ab]
C[Black dies.
]))
(;B[ab];W[bb];B[bc];W[ba];B[ca];W[da];B[aa];W[ad]
(;B[ec];W[ac]
(;B[ea];W[bb];B[eb]
C[Black lives.
])
(;B[eb];W[bb];B[ea]
C[Black lives.
]))
(;B[eb];W[ac]
(;B[ea];W[bb];B[ec]
C[Black lives.
])
(;B[ec];W[bb];B[ea]
C[Black lives.
]))
(;B[ea];W[ac]
(;B[eb];W[bb];B[ec]
C[Black lives.
])
(;B[ec];W[bb];B[eb]
C[Black lives.
])))
(;B[bb];W[ab];B[ac];W[bc]
(;B[da];W[ad]
(;B[eb];W[ba];B[ec];W[fa]
C[Black dies.
])
(;B[ba];W[ea]
(;B[eb];W[ca]
C[Ko (White to start).
])
(;B[ec];W[ca]
C[Ko (White to start).
])
(;B[fa];W[ca]
C[Ko (White to start).
])))
(;B[aa];W[ad]
(;B[ca];W[ab]
C[Two-step ko, in White’s favour.
])
(;B[da];W[ab]
C[Two-step ko, in White’s favour.
])
(;B[eb];W[ab]
C[Two-step ko, in White’s favour.
])
(;B[ec];W[ab]
C[Two-step ko, in White’s favour.
])))
(;B[eb];W[bb]
C[Black dies.
])
(;B[ec];W[bb]
C[Black dies.
])
(;B[da];W[bb]
C[Black dies.
]))

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