Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 036

36 Black to play Start a ko fight (Black’s first move must take the vital point)

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[ea][fa][fb][fc][fd][ed][dd][bd][be]
AW[bc][cc][dc][ec][eb][da][ad]
C[36
Black to play
Start a ko fight (Black’s first move must take the vital point)]
(;B[ba]
TE[1]C[Correct answer]
;W[cb];B[ca]
C[…Black 1 is the vital point for getting a ko fight.]
LB[ca:3][cb:2][ba:1]
)
(;B[cb]
BM[1]C[Wrong answer]
;W[bb];B[ac];W[ca]
C[…Black 1 does not work in this shape. After Black 3, White lives with 4.]
LB[ca:4][ac:3][bb:2][cb:1]
))

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