Go (Baduk, Weiqi) problems with solutions

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Damezumari tesuji problem 057

Black to play If Black plays A, White answers B and has four liberties. However hard Black tries, their corner dies one move sooner.

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
ST[1]
AB[pa][pb][qb][rb][rc][sc][pc][pd][oe][ne][rf]
AW[sa][ra][ob][oc][od][qc][qd][sd][rd][pe][pf]
C[Black to play
If Black plays A, White answers B and has four liberties.
However hard Black tries, their corner dies one move sooner.
]LB[mc:A][oa:B]
(;B[nb];W[nc];B[mc];W[mb];B[nd];W[na];B[oa];W[nb];B[lb])
(;B[nc]
C[Black 1 is wrong.
];W[nb];B[mc];W[mb];B[lb];W[lc];B[kb];W[nd];B[md]
;W[me];B[ld];W[nf]))

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