Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 198

Black to play What is the most effective way to play against the white group in the corner?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
ST[1]
AB[bp][cp][dp][dm][dn][do][ck][en][fn][gn][hn][ip][hq][jq][fq][fr][cq]
AW[aq][bq][bn][cn][eo][ep][eq][er][dq][cr][go][gp]
C[Black to play
What is the most effective way to play against the white group in the corner?
]
(;B[es]
TE[1]C[Correct answer
];W[ds];B[bs];W[br];B[fs];W[as];B[ap];W[cs])
(;B[ap]
BM[1]C[Wrong answer
];W[bs])
(;B[bs]
BM[1]C[Wrong answer
];W[br];B[es];W[as]))

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