Go (Baduk, Weiqi) problems with solutions

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Group survival problem 001

1 Black to play

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
ST[1]
AB[mb][mc][md][nd][pa][qa][qb][qc][pc][oc]
AW[ra][rb][rc][qd][pd][od][ne][me][ld][la][ma][lb][lc][oa][pb]
C[1
Black to play]
(;B[nb]
TE[1]C[Correct answer]
)
(;B[ob]
BM[1]C[Wrong answer]
;W[nb]LB[nb:2][ob:1]
))

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