Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 010

10 Black to play Save the three stones in the corner

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[bc][cc][cb][ed][ec][eb][dd][fd][gd][gf][hc]
AW[da][ea][db][dc][cd][bd][cf][fb][fc][gc][hd][ic][ib]
C[10
Black to play
Save the three stones in the corner]
;B[ga]
TE[1]C[Correct answer
The placement (oki) 1 is the vital point for capturing the four white stones.]
(;W[fa]
C[See the variation]
;B[hb]
C[…If White plays 2, Black plays 3.]
LB[hb:3][fa:2][ga:1]
)
(;W[ha];B[ca]
C[…If White plays 2, Black plays 3. White cannot save the four stones /\\.]
LB[ca:3][ha:2][ga:1]
TR[dc][db][da][ea]
))

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