Go (Baduk, Weiqi) problems with solutions

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Endgame (yose) tesuji problem 114

Black to play. This is an old Chinese problem. How can Black reduce White’s corner?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[13]
ST[2]
AB[jc][id][ie][je][ke][le][me][md]
AW[mc][lb][ld][kd][jd][ic][ib][gc]
C[This is an old Chinese problem. How can Black reduce White’s corner?]
;B[kb]
(;W[jb];B[la];W[kc];B[mb];W[ka];B[lc];W[kb];B[mc])
(;W[lc]
C[White’s mistake!]
;B[la];W[jb];B[mb]
C[A big ko!]
))

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