Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 035

35 Black to play Make life for the group (Black’s first move must take the vital point for making seki)

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[ab][bc][cc][dc][ec][eb][ea]
AW[fb][fa][fc][fd][ed][dd][bd][be][ba][cb]
C[35
Black to play
Make life for the group (Black’s first move must take the vital point for making seki)]
(;B[da]
TE[1]C[Correct answer]
(;W[bb]
C[See the variation]
;B[ca];W[ad];B[ac]
C[…Black 1 is the vital point. After Black 5 the group lives in seki.]
LB[ac:5][ad:4][ca:3][bb:2][da:1]
)
(;W[ca];B[bb]
C[…This also results in seki.]
LB[bb:3][ca:2][da:1]
))
(;B[bb]
BM[1]C[Wrong answer]
;W[da]
C[…Black 1 lets White take the vital point and leave a dead eye shape of 5 points. The black group dies.]
LB[da:2][bb:1]
))

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