Go (Baduk, Weiqi) problems with solutions

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Endgame (yose) tesuji problem 060

Black to play. Black needs to defend at A. But how can Black keep sente?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[13]
ST[2]
AB[jb][kc][kd][jd][id][hd][gd][fc][fd]
AW[ic][jc][ia][hc][gc][fb][eb][dc]
C[Black needs to defend at A. But how can Black keep sente?]
LB[kb:A]
;B[ha]
(;W[ib];B[kb];W[gb])
(;W[ga]
C[White’s mistake! Now Black can play elsewhere, since
White is in damezumari]
))

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Endgame (yose) tesuji problem 061 |>
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