Go (Baduk, Weiqi) problems with solutions

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Endgame (yose) tesuji problem 110

Black to play. How can Black reduce White’s corner?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[13]
ST[2]
AB[de][df][dg][dh][di][dj][dk][dl][cl][cg][bf]
AW[bl][ck][cj][ci][ch][bg][cf][ce][be]
C[How can Black reduce White’s corner?]
;B[bk];W[bj];B[al]
(;W[ak];B[bh];W[af];B[bm])
(;W[bm]
C[This is a dangerous line: a big ko arises...]
;B[bh];W[af];B[aj]))

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