Go (Baduk, Weiqi) problems with solutions

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Refuting a trick play (hamete) problem 043

43 Black to play. The marked white move is wrong, even though it looks natural. How can Black take advantage of the mistake?

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(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[qp][op][pq][lp][mq]
AW[oq][or][mp][mo][lq]
;W[tt]C[43
Black to play
The marked white move is wrong, even though it looks natural. How can Black take advantage of the mistake?]
TR[lq]
(;B[lr]
TE[1]C[Correct answer
Black must play 1.
See the continuation]
;W[kq];B[np];W[mr];B[nq]
(;W[kr]
C[See the variation]
;B[nr]
C[…Black then takes the vital point 3. White has to answer with 4 and 6. Black captures two white stones with 7, and Black’s shape is solid.]
LB[nr:7][kr:6][nq:5][mr:4][np:3][kq:2][lr:1]
)
(;W[nr];B[kr];W[jq];B[jr]
C[…If White connects at 6, Black extends with 7 and 9 and wins the semeai.]
LB[jr:9][jq:8][kr:7][nr:6][nq:5][mr:4][np:3][kq:2][lr:1]
))
(;B[nq]
BM[1]C[Wrong answer
See the continuation]
;W[np];B[lr];W[kq];B[nr];W[oo];B[pp];W[kr]
C[…Black 1 and 3 capture the white stones easily enough, but White gets the good kikashi 6 and 8. This result is good for White.]
LB[kr:8][pp:7][oo:6][nr:5][kq:4][lr:3][np:2][nq:1]
))

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