Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 019

19 Black to play Kill the white group; the first move matters most

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[ac][ad][bd][cd][dd][ed][ec][eb]
AW[ab][ba][bc][cc][dc]
C[19
Black to play
Kill the white group; the first move matters most]
(;B[da]
TE[1]C[Correct answer]
(;W[ca]
C[See the variation]
;B[cb]
C[…Black 1 is the vital point of this shape. After White 2, Black destroys White’s eye shape with 3, exploiting the shortage of liberties.]
LB[da:1][ca:2][cb:3]
)
(;W[cb];B[ca]
C[…The white group is dead.]
LB[da:1][cb:2][ca:3]
))
(;B[cb]
BM[1]C[Wrong answer]
;W[db];B[da];W[bb]
C[…Black 1 is a mistake. White lives with 2 and 4.]
LB[cb:1][db:2][da:3][bb:4]
))

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