Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 025

25 Black to play Make life for the group (Black must capture the two white stones)

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[bb][eb][ec][fc][gb][fa][dd][cd][cc]
AW[cb][db][bc][bd][be][cf][ee][fd][hb][hc][gc]
C[25
Black to play
Make life for the group (Black must capture the two white stones)]
(;B[ba]
TE[1]C[Correct answer]
;W[ab];B[da]
C[…Black takes the vital point 1. White cannot win the semeai because of the special property of the corner.]
LB[ba:1][ab:2][da:3]
)
(;B[ab]
BM[1]C[Wrong answer]
;W[ba];B[da];W[ac]
C[…Against Black 1, White answers 2 and 4. The two black stones are captured and the group dies.]
LB[ab:1][ba:2][da:3][ac:4]
))

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