Go (Baduk, Weiqi) problems with solutions

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Refuting a trick play (hamete) problem 044

44 Black to play. White tries to settle quickly with the marked move, but in fuseki this is too passive. How can Black take the advantage?

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(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[qp][kp][rq]
AW[oq][qq][rr]
;W[tt]C[44
Black to play
White tries to settle quickly with the marked move, but in fuseki this is too passive. How can Black take the advantage?]
TR[rr]
(;B[pq]
TE[1]C[Correct solution
See the continuation]
;W[qr];B[pp];W[pr];B[op];W[nq];B[np]
C[…Black presses with 1 and 3, forcing White low, and then builds a powerful wall with 5 and 7.]
LB[np:7][nq:6][op:5][pr:4][pp:3][qr:2][pq:1]
)
(;B[rp]
BM[1]C[Wrong answer
Black 1 is not active enough.
See the continuation]
;W[pr]
C[…White builds good shape with 2. Black can no longer get good influence.]
LB[pr:2][rp:1]
)
(;B[qr]
BM[1]C[Wrong answer
See the continuation]
;W[pq];B[sr];W[rp];B[rs];W[qo];B[pp];W[oo]
C[…Black 1 and 3 are bad — the corner is too small. Even if the shicho is unfavourable for White, so that Black can save the stone with 7, White plays the squeeze (shibori) 8. The result is still good for White.]
LB[oo:8][pp:7][qo:6][rs:5][rp:4][sr:3][pq:2][qr:1]
))

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