Go (Baduk, Weiqi) problems with solutions

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Go (Baduk, Weiqi) problem 1518

Black to play. 1518 Capturing race (semeai). Difficulty: Intermediate.

(;GM[1]FF[4]SZ[19]AP[goproblems.ru]
AB[bb][hb][ac][bc][cc][dc][ec][gc][hc][bd][fd][ee][fe]
AW[cb][db][eb][fb][gb][fc][cd][dd][ed][be][ce][cg]
C[1518
Capturing race (semeai).
Difficulty: Intermediate.
]
(;B[ba];W[ae];B[ga];W[ad]
(;B[fa]
C[Black wins.
])
(;B[ca]
C[Black wins.
]))
(;B[ca];W[ba]
(;B[aa];W[da]
(;B[ba];W[ae]
C[Black loses.
])
(;B[ga];W[ba]
C[Two-step ko, in Black’s favour.
]))
(;B[ga];W[da];B[fa];W[ae];B[aa];W[ab]
C[Two-step ko, in White’s favour.
]))
(;B[ga];W[ba]
(;B[ca];W[da]
(;B[aa];W[ab]
C[Two-step ko, in White’s favour.
])
(;B[fa];W[ae];B[aa];W[ab]
C[Two-step ko, in White’s favour.
]))
(;B[fa];W[ae]
(;B[ca];W[da];B[aa];W[ab]
C[Two-step ko, in White’s favour.
])
(;B[aa];W[ab]
C[Ko (White to start).
]))))

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Go (Baduk, Weiqi) problem 1519 |>
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