Go (Baduk, Weiqi) problems with solutions

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Play the endgame (yose) correctly 025

Black to play. Black plays first and wins.

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[11]
ST[2]
AB[ba][bb][cb][cc][cd][de][df][dg][dh][ch][bh][di][dj][ei][ij]
[jj][jk][if][jf][jg][jh][ji][ia][ib][jb][jc][jd][ke][kf][ff]
[fe][ge]
AW[bi][cj][dk][ej][fj][fi][fh][fg][gf][hf][hj][hk][ik][ii][ih]
[ig][ie][je][he][id][ic][gb][hb][ca][da][db][dc][dd][ed][fd]
[ee][gd]
C[Black plays first and wins.]
(;B[aj];W[ai];B[ci];W[bj];B[ah]
C[Black’s follow-up at A threatens to start a ko, so White defends.]
LB[bk:A]
;W[ak];B[ef];W[ha]
C[Black 25, White 24.]
)
(;B[ah]
BM[1]C[A mistake!]
;W[ef];B[aj];W[bj];B[ai];W[ha]
C[Black 25, White 25.]
))

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