Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 033

33 Black to play Kill the white group (Black’s second move must destroy the eye shape of the white group)

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[ca][bb][bc][ib][ic][id][hd][ge][ee][ed][cd][ce]
AW[cb][cc][da][ec][fc][hc][gc][ha][hb]
C[33
Black to play
Kill the white group (Black’s second move must destroy the eye shape of the white group)]
(;B[dc]
TE[1]C[Correct answer]
;W[db]
(;B[ea]
C[See the variations]
;W[dd];B[fb]
C[…After the exchange 1-2, Black plays 3, the key move for capturing the white group.]
LB[fb:5][dd:4][ea:3][db:2][dc:1]
)
(;B[fb]
BM[1]C[Wrong continuation]
;W[fa];B[eb];W[dd];B[gb]
C[…White answers 3 with 4. Black has managed only a seki.]
LB[gb:7][dd:6][eb:5][fa:4][fb:3][db:2][dc:1]
)
(;B[fa]
BM[1]C[Wrong continuation]
;W[fb]
C[…This variation also ends in seki.]
LB[fb:4][fa:3][db:2][dc:1]
))
(;B[db]
BM[1]C[Wrong answer]
;W[dc];B[ea];W[fa]
C[…The cut 1 is a mistake. After White 4, Black cannot destroy the eye shape of the white group.]
LB[fa:4][ea:3][dc:2][db:1]
))

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