Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 012

12 Black to play Save the six stones (beware of a ko fight)

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[ea][fb][fc][fd][dc][dd][cd][be][cf][ee][ef][ib][hc]
AW[ca][db][eb][ec][ed][cc][bc][bd][fe][ge][ie][id][jc][jb]
C[12
Black to play
Save the six stones (beware of a ko fight)]
(;B[fa]
TE[1]C[Correct answer]
;W[ab];B[cb];W[bb];B[da];W[ad];B[cb]
C[…Black 1 is the vital point for attacking the white stones in the corner. White must answer 2 to get two eyes in the corner. After 3 and 5 White cannot connect at 3, so White has to make eyes with 6. Black takes the four stones and connects successfully.]
LB[ad:6][da:5][bb:4][cb:7][ab:2][fa:1]
)
(;B[ab]
BM[1]C[Wrong answer]
;W[bb];B[fa];W[da];B[ba];W[aa]
C[…Black 1 may look like the vital point, but White plays 2 and 4 and gets a ko fight.]
LB[aa:6][da:4][fa:3][bb:2][ab:1]
))

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