Go (Baduk, Weiqi) problems with solutions

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Refuting a trick play (hamete) problem 012

12 Black to play. With the marked move White tries to break the link between Black’s stones. How should Black answer?

If the variation letters A, B and C are not shown on the board, reload the page or press "next move".

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[pn][oq][mp][np]
AW[qp][po][mq][lp][kq]
;W[tt]C[12
Black to play
With the marked move White tries to break the link between Black’s stones. How should Black answer?]
TR[po]
(;B[on]
TE[1]C[Correct answer
Black 1 is correct, because it develops the weak stone.
See the continuation]
(;W[qn]
C[See the variation]
;B[qm];W[rn];B[pl];W[qr];B[ln]
C[… Black 5 and 7 keep the connection, and Black gets good outside influence.]
LB[ln:7][qr:6][pl:5][rn:4][qm:3][qn:2][on:1]
)
(;W[oo];B[nn];W[no];B[mo];W[mn];B[lo]
C[…If White pushes through with 2 and 4 and then cuts at 6, Black comes out with 7. White’s stones on the right are weakened, and White will not be able to attack the black group easily.]
LB[lo:7][mn:6][mo:5][no:4][nn:3][oo:2][on:1]
))
(;B[oo]
BM[1]C[Wrong answer
Black 1 is a mistake.
See the continuation]
;W[qn];B[pm];W[qm];B[pl];W[rk]
C[…White can press with 2. After the slide (suberi) at 6 the position is better for White, because Black cannot make effective use of the wall.]
LB[rk:6][pl:5][qm:4][pm:3][qn:2][oo:1]
))

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