Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 017

17 Black to play Make life for the group (Black must take the vital point)

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[bb][cc][dc][eb]
AW[fb][ec][ed][gc][bd][ce]
C[17
Black to play
Make life for the group (Black must take the vital point)]
(;B[ca]
TE[1]C[Correct answer]
;W[db];B[ea];W[ab];B[ac];W[bc];B[aa]
C[…Black 1 is the vital point for making two eyes.]
LB[ca:1][db:2][ea:3][ab:4][ac:5][bc:6][aa:7]
)
(;B[da]
BM[1]C[Wrong answer]
;W[ab];B[ac];W[bc];B[cb];W[ba];B[aa]
C[…If Black plays 1, White gets a ko fight with 2–6.]
LB[da:1][ab:2][ac:3][bc:4][cb:5][ba:6][aa:7]
)
(;B[db]
BM[1]C[Wrong answer]
;W[ca];B[bc];W[ac];B[ab];W[ea];B[da];W[ba]
C[…Black 1 lets White take the vital point 2. Black cannot make two eyes.]
LB[db:1][ca:2][bc:3][ac:4][ab:5][ea:6][da:7][ba:8]
))

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