Go (Baduk, Weiqi) problems with solutions

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Refuting a trick play (hamete) problem 080

80 Black to play. White was too hasty with the marked move. It cannot be played in this position.

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[qp][lq]
AW[np][qq]
;W[tt]C[80
Black to play
White was too hasty with the marked move. It cannot be played in this position.]
TR[qq]
(;B[pp]
TE[1]C[Correct answer
See the continuation]
;W[pq];B[oq]
(;W[op]
C[See the variation]
;B[nq];W[rp];B[ro];W[rq];B[pn]
C[…The combination of 1 and 3 is the right way to split White. Black gets good shape on both sides.]
LB[pn:9][rq:8][ro:7][rp:6][nq:5][op:4][oq:3][pq:2][pp:1]
)
(;W[or];B[nq];W[nr];B[mq]
C[…If White plays 4 and 6 to secure the corner, Black answers with 5 and 7, making good shape.]
LB[mq:7][nr:6][nq:5][or:4][oq:3][pq:2][pp:1]
))
(;B[pq]
BM[1]C[Wrong answer
Black has chosen the wrong way to split the white stones.
See the continuation]
;W[pp];B[pr];W[qo];B[rp];W[po];B[rq];W[oq]
C[…When White cuts at 2, Black is in trouble. In the end Black saves the weak stone and helps the corner, but White builds good outside shape.]
LB[oq:8][rq:7][po:6][rp:5][qo:4][pr:3][pp:2][pq:1]
))

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