Go (Baduk, Weiqi) problems with solutions

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Endgame (yose) tesuji problem 078

Black to play. Where is the vital point for reducing White’s territory? White must avoid a ko fight.

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[13]
ST[2]
AB[jb][jc][kd][ke][le][lf][je][ie][he][ge][fe][fd][fc][eb][ea]
AW[jd][id][hd][gd][ic][gc][hb][fb][fa][kc][lc][ld]
C[Where is the vital point for reducing White’s territory? White
must avoid a ko fight.]
;B[mb]
(;W[kb];B[md];W[ja];B[mc])
(;W[lb]
C[This is the way to a ko for White!]
;B[la];W[ka];B[md]))

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