Go (Baduk, Weiqi) problems with solutions

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Fighting tesuji problem 110

Black to play How can Black save the corner group?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
ST[1]
AB[ar][br][cr][dr][cq][dq][eq][cp][bo][do][eo][fo][go][ip][kp][jp][kq]
AW[bs][bq][bp][co][cn][bn][dp][ep][fp][gq][fr][er][iq][jq]
C[Black to play
How can Black save the corner group?
]
(;B[hr]
TE[1]C[Correct answer
]
(;W[hq];B[fq]
C[The points A and B are miai.
]LB[gr:B][gp:A]
)
(;W[fq];B[hq];W[ds];B[gp];W[cs];B[gr]))
(;B[fq]
BM[1]C[Wrong answer
];W[gp];B[hr];W[gr];B[hq];W[hp])
(;B[gp]
BM[1]C[Wrong answer
];W[fq];B[hr];W[hq]))

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