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Refuting a trick play (hamete) problem 030

30 Black to play How can Black refute White’s trick play (hamete), the marked move?

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][oo][mq][kp]
AW[qp][mn][pn][nq][mp]
;W[tt]C[30
Black to play
How can Black refute White’s trick play (hamete), the marked move?]
TR[nq]
(;B[np]
TE[1]C[Correct answer
Black must play 1.
See the continuation]
;W[lq];B[mo]
(;W[mr]
C[See the variation]
;B[lp]
C[… White plays a counter-atari at 2, but Black gives up the stone and builds good shape with 3 and 5.]
LB[lp:5][mr:4][mo:3][lq:2][np:1]
)
(;W[lp];B[lo];W[mr];B[jo]
C[…If White answers 3 by connecting at 4, Black again makes good shape with 5 and 7.]
LB[jo:7][mr:6][lo:5][lp:4][mo:3][lq:2][np:1]
))
(;B[nr]
BM[1]C[Wrong answer
Black 1 is bad, even though Black does manage to connect.
See the continuation]
;W[np];B[lq];W[op];B[pq];W[qq]
C[…As a result White gets a very good shape.]
LB[qq:6][pq:5][op:4][lq:3][np:2][nr:1]
))

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