Go (Baduk, Weiqi) problems with solutions

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Refuting a trick play (hamete) problem 051

51 Black to play. White has connected with the marked move, but it is a big mistake, because Black can...

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(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[oq][pq][qp][rp][ro][qn][np]
AW[qr][qq][qo][po][pp][op][pn]
;W[tt]C[51
Black to play
White has connected with the marked move, but it is a big mistake, because Black can…]
TR[po]
(;B[mq]
TE[1]C[Correct answer
In this situation Black does best to play 1.
See the continuation]
(;W[qm]
C[See the variation]
;B[rn];W[pl];B[rr]
C[…White 2 and 4 are necessary, but Black captures the corner stones with 5. White suffers a big loss.]
LB[rr:5][pl:4][rn:3][qm:2][mq:1]
)
(;W[rn];B[qm];W[rm];B[pm];W[on];B[rl]
C[…White 2 and 4 are an overplay. Black gains liberties with 5 and captures the cutting stones with 7.]
LB[rl:7][on:6][pm:5][rm:4][qm:3][rn:2][mq:1]
))
(;B[pr]
BM[1]C[Wrong answer
Black 1 is too slow.
See the continuation]
;W[nq];B[nr];W[mq];B[rr];W[mr];B[rq];W[qm]
C[…White answers with the severe cut 2. In the end Black captures the corner stones, but White’s outside influence is worth much more.]
LB[qm:8][rq:7][mr:6][rr:5][mq:4][nr:3][nq:2][pr:1]
))

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