Go (Baduk, Weiqi) problems with solutions

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Endgame (yose) tesuji problem 045

Black to play. The white stones in the corner live, but Black blocks them in sente. How?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[13]
ST[2]
AB[mc][md][ld][kd][jd][id][hd][ec]
AW[mb][la][lc][kc][le][kf][ki][ie][ig]
C[The white stones in the corner live, but Black blocks them in sente. How?]
;B[kb]
(;W[jb];B[jc];W[lb];B[ib];W[ka];B[ia];W[ja])
(;W[jc]
C[If White tries to extend, White dies after Black 5.]
;B[jb];W[ic];B[ib];W[hc];B[gc];W[hb];B[gb];W[ia]
;B[lb];W[ha];B[ga]))

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