Go (Baduk, Weiqi) problems with solutions

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Tsumego: get a ko 002

2 Black to play

How to start a ko fight?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[rb][pc][nb][nc][od][pd][qd][rd][qe][oe][of][pf]
AW[qc][rc][qb][ob][re][sd][qf][rg][pg][og][nf][ne][ld][lb]
C[2
Black to play
How to start a ko fight?]
;B[pb]
TE[1]C[Correct answer]
;W[pa];B[sa]LB[sa:3][pa:2][pb:1]
)

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