Go (Baduk, Weiqi) problems with solutions

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Play the endgame (yose) correctly 021

White to play. White plays first and wins.

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[11]
ST[2]
AB[ac][bc][cc][dc][cb][cd][eb][fa][fb][fc][ed][ee][ef][ff][ia]
[ib][jc][jd][je][jf][if][kf][jg][bj][bk][ci][di][ei][fi][fj]
[gj][gk][gh]
AW[ga][gb][gc][hb][fd][fe][ge][he][ic][id][aj][bi][bh][ch][dh]
[cg][ad][bd][be][ce][dd][df][eg][fg][gg][hg][hh][hi][gi][hj]
[hk][ih][jh][kh][kg]
C[White plays first and wins.]
PL[W]
(;W[ek];B[dj];W[dk];B[ck]
C[Later Black must play A and B.]
LB[fk:B][ej:A]
;W[de];B[fh];W[ie]
C[Black 19, White 20.]
)
(;W[dk]
BM[1]C[A mistake!]
;B[ek];W[de];B[fh];W[ie]
C[Black 20, White 20.]
))

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