Go (Baduk, Weiqi) problems with solutions

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Refuting a trick play (hamete) problem 018

18 Black to play. White has played the marked move. How can Black deal with this situation?

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][mo]
AW[qp][lq][np]
;W[tt]C[18
Black to play
White has played the marked move. How can Black deal with this situation?]
TR[np]
(;B[po]
TE[1]C[Correct answer
See the continuation]
(;W[qo]
C[See the variation]
;B[pn];W[qm];B[no]
C[…Black 1 and 3 are the best continuation. White has to run out with 4, but the move 5 secures the connection and makes the marked stone useless.]
LB[no:5][qm:4][pn:3][qo:2][po:1]
TR[np]
)
(;W[no];B[qo];W[mn];B[rp]
C[…If White presses with 2, Black takes the corner with 3 and 5. This result is good for Black.]
LB[rp:5][mn:4][qo:3][no:2][po:1]
))
(;B[mp]
BM[1]C[Wrong answer
Black 1 is a hasty move.
See the continuation]
;W[nq];B[mq];W[mr];B[lr];W[or];B[kq];W[on]
C[… Although Black takes the white stone with 5 and 7, White gets a huge corner.]
LB[on:8][kq:7][or:6][lr:5][mr:4][mq:3][nq:2][mp:1]
))

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Refuting a trick play (hamete) problem 019 |>
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