Go (Baduk, Weiqi) problems with solutions

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Tsumego: get a ko 029

29 Black to play

How to start a ko fight?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[ra][rb][rc][qc][pe][qe][qd][oe][nd][md][ld][kd][jd]
AW[od][oc][ob][pc][qa][qb][ic][kb][kc][lc][ne][nf][og][qf][qg]
[rd][re]
C[29
Black to play
How to start a ko fight?]
;B[nb]
TE[1]C[Correct answer]
;W[nc];B[oa];W[pb];B[mc];W[mb];B[ma]LB[ma:7][mb:6][mc:5][pb:4][oa:3][nc:2][nb:1]
)

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