Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 015

15 Black to play Kill the white group (Black must exploit the shortage of liberties of the white stones)

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[ab][ad][ec][fd][ed][dd][cd][bd][ga][gb][gc]
AW[ac][bc][cc][dc][ba][eb][fb][fc]
C[15
Black to play
Kill the white group (Black must exploit the shortage of liberties of the white stones)]
(;B[bb]
TE[1]C[Correct answer]
;W[cb];B[da];W[ea];B[fa]
C[…The combination of 1 and 3 is very important. White cannot make two eyes because of a shortage of liberties.]
LB[fa:5][ea:4][da:3][cb:2][bb:1]
)
(;B[fa]
BM[1]C[Wrong answer]
;W[da];B[ea];W[cb]
C[…If Black plays 1, White gives up three stones and makes eyes with 2–4.]
LB[cb:4][ea:3][da:2][fa:1]
))

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