Go (Baduk, Weiqi) problems with solutions

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Refuting a trick play (hamete) problem 015

15 Black to play. White’s marked move looks familiar, but it does not work in this position. White will soon be in serious trouble.

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[pq][ql]
AW[qo][pp]
;W[tt]C[15
Black to play
White’s marked move looks familiar, but it does not work in this position. White will soon be in serious trouble.]
TR[pp]
(;B[qq]
TE[1]C[Correct answer
Black should extend towards the corner with 1.
See the continuation]
(;W[np]
C[See the variation]
;B[oq];W[nn];B[mq]
C[…White is forced to answer 2 and 4. This result is good for Black, because White’s four stones are not working efficiently.]
LB[mq:5][nn:4][oq:3][np:2][qq:1]
)
(;W[oq];B[op];W[or];B[oo];W[qp];B[rq];W[pr];B[qn]
C[… This variation resembles the usual joseki. Even so, the move 9 captures three black stones. If White plays A, Black plays B. White cannot gain any extra liberties.]
LB[qn:9][pr:8][rq:7][qp:6][oo:5][or:4][op:3][oq:2][qq:1][po:B][rn:A]
))
(;B[oq]
BM[1]C[Wrong answer
Black 1 is too passive.
See the continuation]
;W[qq];B[qr];W[rq]
C[…White settles very comfortably with 2 and 4.]
LB[rq:4][qr:3][qq:2][oq:1]
))

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