Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 058

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

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
ST[1]
AB[br][cs][cq][dp][bp][co][eq][ep][gp][hp][ip][jp][kp][kq][kr][ks][js]
AW[is][jr][fq][gq][hq][iq][er][cr][dr][dq]
C[Black to play
How can Black kill the white group?
]
(;B[jq]
TE[1]C[Correct answer
]
(;W[ir];B[ds];W[es];B[fr];W[bs];B[gr];W[gs];B[hr])
(;W[fs];B[ir];W[ds];B[gs]))
(;B[ds]
BM[1]C[Wrong answer
];W[es];B[fr];W[bs];B[gr];W[hr];B[jq];W[cs])
(;B[gs];W[fs];B[hs];W[hr]
C[If White 4 is at A, Black plays B.
]LB[ir:A][ds:B]
))

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