Go (Baduk, Weiqi) problems with solutions

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How much is this endgame move worth? 007

Black to play. How many points does White lose by not answering Black 1? How should Black continue?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[13]
ST[2]
AB[ib][hc][gd][he][dd][bc]
AW[jc][jd][if][kg]
C[How many points does White lose by not answering Black 1? How should Black continue?]
LB[ib:1]
;B[kb];W[jb];B[ja];W[lc];B[lb]
(;W[ld];B[mb]
C[Black gets at least 11 points.]
)
(;W[mb]
C[White’s mistake! This way White ends in gote.]
;B[kc];W[ld];B[kd];W[ke];B[ka];W[je]
C[White’s loss is again 11 points.]
))

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