Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 002

2 Black to play Kill the white group (find the vital point for the attack)

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[bg][cg][cf][de][dd][dc][cb][db]
AW[ba][bb][cc][cd][ce][bf]
C[2
Black to play
Kill the white group (find the vital point for the attack)]
(;B[ad]
TE[1]C[Correct answer
See the continuation]
;W[be];B[ae];W[af];B[bc]
C[…Black 1 strikes the vital point of White’s shape. After 5 White can do nothing because of damezumari.]
LB[ad:1][be:2][ae:3][af:4][bc:5]
)
(;B[af]
BM[1]C[Wrong answer
See the continuation]
;W[ad]
C[…If Black plays 1, White takes the vital point 2 first. The group lives.]
LB[af:1][ad:2]
))

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