Go (Baduk, Weiqi) problems with solutions

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Refuting a trick play (hamete) problem 067

67 Black to play. White should have run out into the centre, but played inside instead...

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(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[qp][lp][oo][po]
AW[op][pp][qq][pm]
;W[tt]C[67
Black to play
White should have run out into the centre, but played inside instead…]
(;B[qo]
TE[1]C[Correct answer
The stone on the 3-4 point (komoku) is important, so Black must play 1.
See the continuation]
(;W[np]
C[See the variation]
;B[no];W[rq];B[mp]
C[…White has to live inside. Black gets a good enclosing wall.]
LB[mp:5][rq:4][no:3][np:2][qo:1]
)
(;W[no];B[np];W[nq];B[mp];W[rq];B[nn]
C[…If White still tries to run out with 2, Black cuts at 3. This result is even worse for White, because Black gets a good squeeze later on.]
LB[nn:7][rq:6][mp:5][nq:4][np:3][no:2][qo:1]
))
(;B[np]
BM[1]C[Wrong answer
Black 1 may look like the vital point, but…]
;W[qo];B[rp];W[rq];B[qn];W[ro];B[rn];W[sp]
C[…White cuts at 2 and gets a big corner. Black has the good kikashi 5 and 7, but Black’s shape is weak because of the cutting points at A and B.]
LB[no:B][pn:A][sp:8][rn:7][ro:6][qn:5][rq:4][qo:2][np:1]
))

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