Go (Baduk, Weiqi) problems with solutions

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Refuting a trick play (hamete) problem 042

42 Black to play. The marked move is a mistake by White. Black should exploit it and take the advantage.

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(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
ST[2]
AB[oq][mp][mo]
AW[qp][op][lp][lq]
;W[tt]C[42
Black to play
The marked move is a mistake by White. Black should exploit it and take the advantage.]
TR[lq]
(;B[pp]
TE[1]C[Correct answer
Black takes the key point 1.
See the continuation]
(;W[po]
C[See the variation]
;B[pq];W[qq]
(;B[mq]
C[…If White defends with 2 and 4, Black blocks at 5. Black’s shape is solid, while White’s shape has defects.]
LB[pp:1][po:2][pq:3][qq:4][mq:5]
)
(;B[qo];W[nq];B[oo];W[pn];B[np]))
(;W[pq];B[po];W[nq];B[or]
C[…White 2 and 4 are an overplay. Black extends with 3 and 5, and White has no idea what to do next.]
LB[pp:1][pq:2][po:3][nq:4][or:5]
))
(;B[mq]
BM[1]C[Wrong answer
See the continuation]
;W[pq]
C[…Black 1 connects solidly, but now White makes good shape with 2.]
LB[mq:1][pq:2]
))

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