Go (Baduk, Weiqi) problems with solutions

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Tsumego: get a ko 006

6 Black to play

How to start a ko fight?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[qb][rc][rd][qd][qe][pe][oe][of][nf][me][md][nd][mc][mb][lb]
[la]
AW[rb][na][ma][nc][nb][qc][pb][pc][pd][rf][kb][jc][kd][ld][kf]
[mg][ng][og][qg]
C[6
Black to play
How to start a ko fight?]
;B[ra]
TE[1]C[Correct answer]
(;W[qa]
C[See the variation]
;B[sb]LB[sb:3][qa:2][ra:1]
)
(;W[sb];B[oc];W[ob];B[pa]LB[pa:5][ob:4][oc:3][sb:2][ra:1]
))

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