Go (Baduk, Weiqi) problems with solutions

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Tsumego: capture the stones 071

71 Black to play

How can Black kill the white group?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[rb][rc][qd][qe][qf][pg][nf][me][le][ke][kd][kc][kb][ja][ib]
[lc][nd]
AW[ka][la][lb][mc][md][ld][nb][ne][pe][oe][pd][pc][qc]
C[71
Black to play
How can Black kill the white group?]
;B[ob]
TE[1]C[Correct answer]
;W[oc];B[na];W[mb];B[pb];W[qb];B[qa]LB[qa:7][qb:6][pb:5][mb:4][na:3][oc:2][ob:1]
)

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