Go (Baduk, Weiqi) problems with solutions

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Direction of play and tesuji problem 025

25 Black to play How can Black attack the white group?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[cp][dp][fp][dn][en][dj][dd]
AW[cn][cl][dm][co][fl]
C[25
Black to play
How can Black attack the white group?]
(;B[ck]
TE[1]C[Correct answer
Kosumi-tsuke 1 is severe and correct. Black threatens to destroy the shape with the hane at A.
See the continuation]
LB[bl:A]
(;W[em]
C[See the variation]
;B[fj]
C[…The 2-3 exchange lets Black expand their moyo in the upper left nicely while attacking.]
LB[fj:3][em:2][ck:1]
)
(;W[bk];B[dl];W[bj];B[em];W[cm];B[ch]
C[…The hane 2 gets White nowhere. The beautiful atekomi 3 follows, and Black blocks the opponent off.
In other circumstances Black could also play 3 at 4, expanding the moyo on the left and preparing the attack.]
LB[ch:7][cm:6][em:5][bj:4][dl:3][bk:2][ck:1]
))
(;B[cj]
BM[1]C[Wrong answer
Although Black builds an "iron pillar", this move has little effect on the white stones.]
))

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