Go (Baduk, Weiqi) problems with solutions

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Tsumego: get a ko 001

1 Black to play

How to start a ko fight?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[qd][pd][pc][pb][oc][nc][nd][ne][oe][pf][re][rf]
AW[rc][qc][rd][pe][qe][qf][qg][qh][nb][lb][mc][md][me][nf][of]
C[1
Black to play
How to start a ko fight?]
;B[rb]
TE[1]C[Correct answer]
;W[qb];B[qa];W[ra];B[sa];W[sc];B[sd];W[se]
;B[sf];W[rg];B[sd]LB[rg:10][sf:9][sd:11][sc:6][sa:5][qa:3][qb:2][rb:1]
)

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