Go (Baduk, Weiqi) problems with solutions

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Fighting tesuji problem 013

Black to play How can Black save the corner group?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
ST[1]
AB[cs][cr][cq][bq][dp][ep][en][gp][hp][iq]
AW[hq][fq][dq][dr][bp][cp][cn][ir][hr]
C[Black to play
How can Black save the corner group?
]
(;B[fr]
TE[1]C[Correct answer
]
(;W[eq];B[gq];W[gr];B[es])
(;W[er];B[es];W[gr];B[fs]))
(;B[gq]
BM[1]C[Wrong answer
];W[gr];B[er];W[eq]))

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