Go (Baduk, Weiqi) problems with solutions

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Endgame (yose) tesuji problem 096

Black to play. Black can close off the right side at A — how can this be done in sente?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[13]
ST[2]
AB[fa][eb][gb][gc][gd][hd][id][jd][kc][lc][le]
AW[lb][kb][mc][jc][ic][hc][hb][ha][ga]
C[Black can close off the right side at A — how can this be done in
sente?]
LB[md:A]
;B[mb]
C[White cannot ignore Black 1, because after Black plays at
A a ko fight for the life of the white group begins.]
LB[la:A]
;W[ma];B[la];W[ka];B[md];W[mb]TE[1])

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Endgame (yose) tesuji problem 097 |>
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