Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 023

23 Black to play Kill the white group (exploit the shortage of liberties of the white stones)

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[hb][hc][gc][fc][dc][dd][cd][bd]
AW[bc][cc][db][eb][fb][gb]
C[23
Black to play
Kill the white group (exploit the shortage of liberties of the white stones)]
(;B[bb]
TE[1]C[Correct answer]
;W[cb];B[ac];W[ab];B[aa];W[ca];B[ad];W[ga];B[ea]
C[…Black 1 is the vital point of this shape. White has no choice and must connect at 2. After 3 White has no room left to make two eyes.]
LB[ea:9][ga:8][ad:7][ca:6][aa:5][ab:4][ac:3][cb:2][bb:1]
)
(;B[ac]
BM[1]C[Wrong answer]
;W[bb];B[ab];W[ba]
C[…If Black plays 1, White makes eyes with 2 and 4.]
LB[ba:4][ab:3][bb:2][ac:1]
))

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