Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 016

16 Black to play Win the semeai (the first move must secure Black’s victory)

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[bb][bc][cc][dd][ed][ce][gc][fc][da]
AW[cb][dc][ec][eb][fd][gd][hc][id]
C[16
Black to play
Win the semeai (the first move must secure Black’s victory)]
(;B[fa]
TE[1]C[Correct answer]
;W[fb];B[gb];W[hb];B[ga];W[ha];B[ea]
C[…Black 1 is the vital point. The continuation up to 7 gives Black the win.]
LB[ea:7][ha:6][ga:5][hb:4][gb:3][fb:2][fa:1]
)
(;B[gb]
BM[1]C[Wrong answer]
;W[fa];B[ga];W[hb];B[ea];W[ha]
C[…If Black starts with 1, White takes the vital point 2. Black loses the semeai.]
LB[ha:6][ea:5][hb:4][ga:3][fa:2][gb:1]
))

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