Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 019

19 Black to play Make life for the group (Black must take the point that is vital for making eyes)

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[bd][cd][cc][cb][dc][ec]
AW[bb][bc][fb][fc][ed][de][ce][be][bg]
C[19
Black to play
Make life for the group (Black must take the point that is vital for making eyes)]
(;B[ab]
TE[1]C[Correct answer]
(;W[ba]
C[See the variation]
;B[eb];W[ad];B[ac];W[aa];B[ac];W[ae];B[ca]
C[…Black starts with 1. In answer to 2, Black makes the second eye with 3. The three white stones cannot connect to the outside and are captured with oiotoshi.]
LB[ab:1][ba:2][eb:3][ad:4][ac:7][aa:6][ae:8][ca:9]
)
(;W[ac];B[ad];W[aa];B[ca];W[eb];B[ba]
C[…If White plays 2, Black lives with 3-7 (the "oshitsubushi" technique).]
LB[ab:1][ac:2][ad:3][aa:4][ca:5][eb:6][ba:7]
))
(;B[ba]
BM[1]C[Wrong answer]
;W[ab];B[ad];W[eb]
C[…If Black plays 1, White kills the group with 2 and 4.]
LB[ba:1][ab:2][ad:3][eb:4]
))

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