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Refuting a trick play (hamete) problem 062

62 Black to play. White plays the marked move when the lower side is more important than the right. 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[op][no]
AW[qp][mq][kp]
;W[tt]C[62
Black to play
White plays the marked move when the lower side is more important than the right. How should Black answer?]
TR[kp]
(;B[qn]
TE[1]C[Correct answer
Black should put pressure on White’s corner stone, and Black 1 is the best move for it.
See the continuation]
;W[po];B[pn];W[oo];B[on];W[np];B[rq]
(;W[oq]
C[See the variation]
;B[rp]
C[…White cuts off the black stone with 4 and 6, but Black takes the corner away with the clever move 7.]
LB[qn:1][po:2][pn:3][oo:4][on:5][np:6][rq:7][oq:8][rp:9]
)
(;W[rp];B[pp]
C[…White tries to split Black with 8, but then Black captures the cutting stones with 9.]
LB[qn:1][po:2][pn:3][oo:4][on:5][np:6][rq:7][rp:8][pp:9]
))
(;B[qq]
BM[1]C[Wrong answer
In this position Black 1 does not work well.
See the continuation]
;W[pq];B[pp];W[oq];B[qo];W[rp]
(;B[ro]
C[See the variation ***]
;W[rq]
C[…White splits Black with 2 and 4, and Black cannot save the stone. White gets a big corner.]
LB[qq:1][pq:2][pp:3][oq:4][qo:5][rp:6][ro:7][rq:8]
)
(;B[nq];W[nr];B[np];W[pr];B[ro];W[rq];B[qk]
C[… Black’s result looks reasonable, but comparing it with the standard line shows that instead of the A-B exchange Black has played the marked move. Of course, that is bad for Black.
*** The variation is taken from Ishida’s joseki dictionary, volume 2.]
LB[lq:B][mp:A][qk:13][rq:12][ro:11][pr:10][np:9][nr:8][nq:7][rp:6][qo:5][oq:4][pp:3][pq:2][qq:1]
TR[no]
)))

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