Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 148

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

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
ST[1]
AB[br][bq][cn][co][cp][hq][ip][iq][kq][lq][ho][in][cl][dm][em][fn][ep]
AW[cq][cr][dp][dn][do][eq][fp][gp][hp][gq]
C[Black to play
How can Black kill the white group?
];B[fr]
TE[1]C[Correct answer
]
(;W[er];B[eo];W[gr];B[gs];W[hr];B[dq]
(;W[cs];B[ir];W[hs];B[fs])
(;W[ir];B[jr];W[cs];B[is];W[hs];B[fs]))
(;W[gr];B[cs];W[ds];B[er]))

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