Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 023

23 Black to play Save the five black stones by capturing four white stones (beware of the ko fight)

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[db][da][ea][cc][cd][bd][ad][dd][fb][gb][hc][hd]
AW[ac][bc][bb][cb][dc][ec][eb][fc][gc][ee][fe][df][bf]
C[23
Black to play
Save the five black stones by capturing four white stones (beware of the ko fight)]
(;B[ab]
TE[1]C[Correct answer]
;W[aa];B[ca]
C[…Black 1 is the vital point of the shape. The white stones cannot make eyes because of a shortage of liberties, and they lose the semeai.]
LB[ab:1][aa:2][ca:3]
)
(;B[ba]
BM[1]C[Wrong answer]
;W[aa]
C[…Black 1 is answered by White 2. A ko fight begins.]
LB[ba:1][aa:2]
))

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