Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 027

27 Black to play Win the semeai (beware of the ko fight)

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[bc][cc][cb][dd][ec][ed][ee][fc][gb][gc]
AW[ac][bd][db][dc][eb][fb][cd][ae][de][df][cf][bf]
C[27
Black to play
Win the semeai (beware of the ko fight)]
(;B[ba]
TE[1]C[Correct answer]
;W[ab];B[fa];W[bb];B[ca]
C[…Black 1 is the vital point. White is one liberty behind.]
LB[ca:5][bb:4][fa:3][ab:2][ba:1]
)
(;B[ca]
BM[1]C[Wrong answer]
;W[ba];B[ab];W[da]
C[…If Black 1, White takes the vital point 2 first. A ko fight arises.]
LB[da:4][ab:3][ba:2][ca:1]
))

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