Go (Baduk, Weiqi) problems with solutions

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Refuting a trick play (hamete) problem 013

13 Black to play White usually tries to get out into the centre as quickly as possible, but here White has played the marked move, which is wrong.

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[oq][qr]
;W[tt]C[13
Black to play
White usually tries to get out into the centre as quickly as possible, but here White has played the marked move, which is wrong.]
TR[qr]
(;B[op]
TE[1]C[Correct answer
See the continuation]
(;W[pp]
C[See the variation]
;B[po];W[pq];B[np];W[qo];B[qn];W[ro];B[pn];W[rp]
C[…White 2 is the best answer to 1, but Black still builds good shape on the outside. After the necessary defence at 10 the original marked stone becomes useless.]
LB[rp:10][pn:9][ro:8][qn:7][qo:6][np:5][pq:4][po:3][pp:2][op:1]
TR[qr]
)
(;W[np];B[pq];W[pr];B[nq];W[or];B[nr];W[oo];B[pp]
C[…White 2 is an overplay; 3 and 5 split White in two. Black will have an easy game here.]
LB[pp:9][oo:8][nr:7][or:6][nq:5][pr:4][pq:3][np:2][op:1]
))
(;B[qm]
BM[1]C[Wrong answer
Black 1 is too passive.
See the continuation]
;W[np]
C[…White manages to get out with 2. Black has missed a good opportunity.]
LB[np:2][qm:1]
))

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