Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 029

29 Black to play Start a ko fight

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[bb][eb][fc][fd][ed][dd][cd][ce][hc][cg]
AW[ab][bc][cc][dc][ec]
C[29
Black to play
Start a ko fight]
;B[ca]
TE[1]C[Correct answer]
(;W[ba]
C[…Black 1 is the key point for getting a ko fight. White cannot live unconditionally.
See the variation]
LB[ba:2][ca:1]
)
(;W[cb];B[ba];W[da];B[bd];W[fb];B[gb]
C[…If White tries to avoid the ko fight with 2 and 4, the group dies after Black 5.]
LB[gb:7][fb:6][bd:5][da:4][ba:3][cb:2][ca:1]
))

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