Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 035

35 Black to play Kill the white group (Black must leave White a dead eye space of 5 points)

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[bd][be][dd][de][fb][fc][fd][hb]
AW[bb][bc][eb][dc][ec]
C[35
Black to play
Kill the white group (Black must leave White a dead eye space of 5 points)]
;B[ac]
TE[1]C[Correct answer]
;W[ab]
(;B[da]
C[See the variation]
;W[ea];B[cb];W[cc];B[ba]
C[…After Black 1, the order of 3 and 5 is important. With 7 Black leaves White a dead eye space of 5 points; the white group dies.]
LB[ba:7][cc:6][cb:5][ea:4][da:3][ab:2][ac:1]
)
(;B[cb]
BM[1]C[Wrong continuation]
;W[cc]
(;B[da]
C[See the variation]
;W[ba];B[ea];W[ca]
C[…If Black plays 3 first and then 5, White lives with 6.]
LB[ca:8][ea:7][ba:6][da:5][cc:4][cb:3][ab:2][ac:1]
)
(;B[ba];W[da]
C[…The white group lives anyway; Black has managed only a seki.]
LB[da:6][ba:5][cc:4][cb:3][ab:2][ac:1]
)))

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