Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 075

Black to play. How can Black kill the white group?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
ST[1]
AB[ar][br][cq][cp][bp][dp][eo][fp][fn][hn][ho][ip][iq][ir]
AW[hs][hr][hq][er][eq][ep][dq][cr][bq][bs]
C[Black to play
How can Black kill the white group?
]
(;B[ds]
TE[1]C[Correct answer
];W[cs]
(;B[gq];W[gr];B[fs];W[gp];B[es])
(;B[fs]
BM[1]C[Wrong continuation
];W[fq];B[es];W[fr]))
(;B[gq]
BM[1]C[Wrong answer
];W[gr];B[ds];W[fq]))

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