Go (Baduk, Weiqi) problems with solutions

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Refuting a trick play (hamete) problem 007

7 Black to play On the right side White has extended one point further than the joseki calls for, but this extension is much too thin.

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(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[oq][oo]
AW[qp][mq][pm]
;W[tt]C[7
Black to play
On the right side White has extended one point further than the joseki calls for, but this extension is much too thin.]
(;B[nq]
TE[1]C[Correct answer
Black 1 looks too slack, but it is the best move in this position.
See the continuation]
(;W[po]
C[See the variation]
;B[mp]
C[…White has to answer at 2, and Black makes good shape on the lower side with 3.]
LB[nq:1][po:2][mp:3]
)
(;W[mp];B[qo];W[po];B[pp];W[pn];B[qq];W[rp];B[ro]LB[nq:1][mp:2][qo:3][po:4][pp:5][pn:6][qq:7][rp:8][ro:9][rq:A][rr:B]
))
(;B[qo]
BM[1]C[Wrong answer
See the continuation]
;W[pp];B[po];W[op];B[np];W[nq];B[rp];W[pr]
C[…If Black tries to split White at once with 1, White splits Black in turn with 2 and 4. This result is not good enough for Black.]
LB[qo:1][pp:2][po:3][op:4][np:5][nq:6][rp:7][pr:8]
))

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