Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 005

5 Black to play Win the capturing race (use the special properties of the corner)

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[cc][dc][db][ec][fc][gc][hb][ib][ic][ed]
AW[bc][cd][hc][hd][gd][fd][dd][ee][be][eb][fb][gb]
C[5
Black to play
Win the capturing race (use the special properties of the corner)]
;B[da]
TE[1]C[Correct answer
Black takes the vital point 1.
See the continuation]
(;W[ca]
C[See the variation]
;B[bb];W[ea];B[cb];W[ab];B[ba]
C[…If White 2, Black answers 3, and White cannot win the semeai because of the special properties of the corner.]
LB[da:1][bb:3][ea:4][cb:5][ab:6][ba:7]
)
(;W[cb];B[bb];W[ba];B[ga]
C[…If White plays 2 and 4, it is essential for Black to answer 5.
If Black carelessly answers A, White gets a ko fight with B.]
LB[da:1][cb:2][bb:3][ba:4][ga:5][ca:A][ab:B]
))

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