Go (Baduk, Weiqi) problems with solutions

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Refuting a trick play (hamete) problem 021

21 Black to play. White’s marked move is a mistake: White should have played atari at A. So how does the marked move differ from A?

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(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[rq][qr][pq][qp][kq]
AW[qo][pp][oq][pr]
;W[tt]C[21
Black to play
White’s marked move is a mistake: White should have played atari at A. So how does the marked move differ from A?]
LB[rp:A]
TR[pr]
(;B[po]
TE[1]C[Correct answer
Black cuts severely with 1.
See the continuation]
;W[qq]
C[See the variation]
;B[rp]
(;W[op];B[qn]
C[…Normally White is forced to run with the heavy group with 2 and 4, and Black profits with 5.]
LB[qn:5][op:4][rp:3][qq:2][po:1]
)
(;W[qn];B[oo]
C[…With 4 White saves the stone, but Black answers by strengthening with 5. This fight suits Black, because White cannot start a ko fight to capture the black corner. As a result White has to look after two weak groups.]
LB[oo:5][qn:4][rp:3][qq:2][po:1]
))
(;B[qq]
BM[1]C[Wrong answer
Black 1 is the obvious move, but it is not good enough.
See the continuation]
;W[oo]
C[…When White defends with 2, the marked stone works better than it would at A.]
LB[rp:A][oo:2][qq:1]
TR[pr]
))

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