Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 105

Black to play. How can they live? The analysis above shows that White can, if desired, reduce the position to a ko fight (a very bad one for White, though).

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
ST[1]
AB[al][bl][cl][cm][cn][co][cp][dp][ep][fq][gp][hp][hq][hr][ir][fm][cr]
AW[bp][bo][bn][bm][am][jr][ip][iq][kq][go][ho][eo][en][em][el][dk][bj][cj][cq][dq][er]
C[Black to play
How can they live?
The analysis above shows that White can, if desired, reduce
the position to a ko fight (a very bad one for White, though).
];B[bq]
TE[1]C[Correct answer
];W[br]
(;B[aq]
(;W[ar];B[dr];W[eq];B[es];W[fr];B[gr];W[ap];B[bq];W[aq]
;B[fs];W[bq];B[gs];W[bs];B[is])
(;W[cs];B[ar];W[dr];B[ap]
C[White can play the ko starting with A.
]LB[as:A]
))
(;B[dr]
BM[1]C[Wrong continuation
];W[eq];B[es];W[fr];B[gr];W[aq];B[fs];W[bq];B[gs]
;W[is]
C[Now A and B are miai for White.
]LB[bs:A][ao:B]
))

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