Go (Baduk, Weiqi) problems with solutions

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Endgame (yose) tesuji problem 012

Black to play. How deeply can Black invade the corner? Where is the vital point?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[13]
ST[2]
AB[ga][fb][fc][gd][fd][id][ie][je][ke][le][me]
AW[lb][ld][md][kd][jd][ic][hb][gb][gc]
C[How deeply can Black invade the corner? Where is the vital
point?]
;B[ia]
(;W[jb];B[ha])
(;W[ha]
C[White’s mistake!]
;B[ib];W[fa];B[jc]))

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