Go (Baduk, Weiqi) problems with solutions

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Refuting a trick play (hamete) problem 073

73 Black to play White’s shape is weak. But how can Black exploit that weakness? It is not easy — it takes real skill.

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(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[qp][mp]
AW[op][pm]
;W[tt]C[73
Black to play
White’s shape is weak. But how can Black exploit that weakness? It is not easy — it takes real skill.]
(;B[pp]
TE[1]C[Correct answer
Black 1 is the best move.
See the continuation]
(;W[oo]
C[See the variation]
;B[oq];W[nq];B[np]
C[…If White extends at 2, Black has the strong continuation 3 and 5. White has no reasonable follow-up.]
LB[np:5][nq:4][oq:3][oo:2][pp:1]
)
(;W[oq];B[oo];W[no];B[on];W[np];B[mq]
C[…If White answers at 2, Black comes out with 3 and 5. White has to play 6, ending up with a heavy group]
LB[mq:7][np:6][on:5][no:4][oo:3][oq:2][pp:1]
))
(;B[oo]
BM[1]C[Wrong answer
Black 1 is not enough here.]
;W[no];B[np];W[po];B[pp];W[on];B[oq]
C[…The continuation up to 7 gives Black a big corner, but White’s influence is worth a good deal too.]
LB[oq:7][on:6][pp:5][po:4][np:3][no:2]
))

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