Go (Baduk, Weiqi) problems with solutions

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Endgame (yose) tesuji problem 098

Black to play. How can Black defend the marked stone in sente?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
ST[2]
AB[pc][qc][ob][od][nd][md][ld][kd][jd][pe][kc][he][gd][gc][fb]
[ec]
AW[gb][oc][nc][mc][lc][nb][kb][jc][ic][hc][ha]
C[How can Black defend the marked stone in sente?]
TR[ob]
;B[ma]
(;W[lb];B[na];W[ib])
(;W[la]
C[If White resists, a big ko fight results.]
;B[na];W[pb];B[lb];W[oa];B[ka];W[jb];B[qb];W[qa]
;B[ra]))

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