Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 022

22 Black to play Kill the white group (Black’s first move must take the vital point)

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[bb][bc][bd][dd][ed][hb][gb][hd][ge][ff][ef][df][cf]
AW[cb][cc][cd][de][ee][fe][ec][fc][fd][fb]
C[22
Black to play
Kill the white group (Black’s first move must take the vital point)]
(;B[ea]
TE[1]C[Correct answer]
;W[da];B[fa];W[eb];B[dc]
C[…Black 1 is the vital point of this shape. White cannot get two eyes.]
LB[dc:5][eb:4][fa:3][da:2][ea:1]
)
(;B[da]
BM[1]C[Wrong answer]
;W[ca];B[fa];W[ea];B[eb];W[db]
C[…Black 1 is answered by 2-6. The white group lives.]
LB[db:6][eb:5][ea:4][fa:3][ca:2][da:1]
))

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