Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 036

36 Black to play Kill the white group (the order of moves matters)

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[ea][fa][fb][fc][fd][ed][de][bd][be]
AW[bc][cc][dc][ec][eb][da]
C[36
Black to play
Kill the white group (the order of moves matters)]
(;B[cb]
TE[1]C[Correct answer]
(;W[bb]
C[See the variation]
;B[ac];W[ab];B[ba]
C[…Black 1 is the vital point. After Black 3 and 5 the white group dies.]
LB[ba:5][ab:4][ac:3][bb:2][cb:1]
)
(;W[ba];B[ab];W[ac];B[bb]
C[…If White plays 2, Black kills with 3 and 5.]
LB[bb:5][ac:4][ab:3][ba:2][cb:1]
))
(;B[ac]
BM[1]C[Wrong answer]
;W[ab];B[cb];W[ba]
C[…If Black plays 1 first and then 3, White makes eyes with 4.]
LB[ba:4][cb:3][ab:2][ac:1]
))

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