Go (Baduk, Weiqi) problems with solutions

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Fighting tesuji problem 120

Black to play How can Black capture White’s key stones?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
ST[1]
AB[bq][cq][dq][ep][fp][fq][eo][en][bm][dm][cm]
AW[cr][dr][er][eq][fr][gr][bp][dp][do][dn][bn][em][fm][hn][hp]
C[Black to play
How can Black capture White’s key stones?
]
(;B[ap]
TE[1]C[Correct answer
]
(;W[bo];B[an];W[ao];B[cn];W[aq];B[co])
(;W[ao];B[cp];W[co];B[cn]))
(;B[an]
BM[1]C[Wrong answer
];W[aq];B[ar];W[ap]))

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