Go (Baduk, Weiqi) problems with solutions

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Refuting a trick play (hamete) problem 004

4 Black to play. In the middle of a joseki White tries to spoil Black’s shape with the marked move. Will it work?

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[oq][po][pn][qq]
AW[qp][mq][qo][qm][pp]
;W[tt]C[4
Black to play
In the middle of a joseki White tries to spoil Black’s shape with the marked move. Will it work?]
TR[pp]
(;B[op]
TE[1]C[Correct answer
See the continuation]
;W[pq];B[pr];W[qr];B[qn]
(;W[or]
C[See the variation]
;B[rm]
C[…Black 1 and 3 are correct. Black 5 is severe. Against the cut at 6 Black builds a splendid shape with 7.]
LB[rm:7][or:6][qn:5][qr:4][pr:3][pq:2][op:1]
)
(;W[rn];B[rq]
(;W[rp]
C[See the variation]
;B[rr]
C[…If White tries to defend with 6, Black 7 is very unpleasant for White.]
LB[rr:9][rp:8][rq:7][rn:6][qn:5][qr:4][pr:3][pq:2][op:1]
)
(;W[or];B[ro];W[ps];B[rp];W[pr];B[rm]
C[…This result suits Black perfectly well.]
LB[rm:13][rp:11][ps:10][ro:9][or:8][rq:7][rn:6][qn:5][qr:4][pr:12][pq:2][op:1]
)))
(;B[pq]
BM[1]C[Wrong answer
See the continuation]
;W[op];B[nq];W[np];B[mr];W[lq];B[lr];W[kq]
C[…Black should not hurry to save the corner stone. White splits Black with 2 and builds splendid influence.]
LB[kq:8][lr:7][lq:6][mr:5][np:4][nq:3][op:2][pq:1]
))

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Refuting a trick play (hamete) problem 005 |>
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